SonoScape S6 Service manual

S6
Portable Digital Color Doppler Ultrasound System
Service Manual
May 5, 2010
S6 Portable Digital Color Doppler Ultrasound System
Service Manual
P/N: 4720-0034-01A
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S6 Portable Digital Color Doppler Ultrasound System
Service Manual
1 Introduction 1-1
1.1 Intended Users . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.3 Software Updates . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Safety Considerations 2-1
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Symbol Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.3 Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.4 Mechanical Safety . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.5 Human Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
3 Description of the System 3-1
3.1 Product Description . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 System Configuration . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.4 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.5 Combined Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.6 Scanning Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.7 Adjustable Parameters . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.7.1 B Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.7.2 Spectral Doppler (PW/CW) . . . . . . . . . . . . . . . 3-7
3.7.3 Color Doppler and Power Doppler . . . . . . . . . . . 3-7
3.7.4 Archive and Backup . . . . . . . . . . . . . . . . . . . . 3-8
3.8 Measurements and Calculations . . . . . . . . . . . . . . . . . 3-8
4 Principle of the S6 System 4-1
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 System Block Diagram . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3 Principle of Probes . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.4 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.5 Functional Boards/Units of the S6 System . . . . . . . . . . . 4-3
4.5.1 Functional Block Diagram . . . . . . . . . . . . . . . . 4-4
4.5.2 Explanations of the System Functions . . . . . . . . . 4-4
4.6 Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
5 S6 Disassembly Instructions 5-1
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5.1 Bottom Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.2 Back Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.3 Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.4 KEAA board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5.5 HDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.6 Voltage Conversion Board . . . . . . . . . . . . . . . . . . . . . 5-10
5.7 Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.8 MPC board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5.9 Ultrasound Module Assembly . . . . . . . . . . . . . . . . . . . 5-12
5.9.1 Ultrasound Metal Shield . . . . . . . . . . . . . . . . . 5-13
5.9.2 Ultrasound Module . . . . . . . . . . . . . . . . . . . . 5-14
5.10 Power Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
5.11 Keyboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
5.12 LCD assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
6 Wiring Instructions 6-1
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.2 Wiring in the System Level . . . . . . . . . . . . . . . . . . . . 6-2
6.3 Detailed Connection Instructions . . . . . . . . . . . . . . . . 6-4
6.3.1 Control Cable for Keyboard Unit (3520-0501) . . . . 6-4
6.3.2 Connection wires for keyboard small board (3520-
0502) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.3.3 Connection wires for trackball (3520-0503) . . . . . 6-4
6.3.4 Connection cable for loud speakers (3520-0504) . . . 6-5
6.3.5 Signal Transmission cable for keyboard (3520-0505) 6-5
6.3.6 SATA cable for HDD (3520-0506) . . . . . . . . . . . . 6-6
6.3.7 LVDS Signal Cable (3520-0507) . . . . . . . . . . . . . 6-6
6.3.8 Cables Connecting Keyboard and motherboard (3520-
0508) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6.3.9 Connection wires for system fan(3520-0509) . . . . . 6-7
6.3.10 DBF USB Signal Cable (3520-0510) . . . . . . . . . . 6-7
6.3.11 USB Cable for µ-Scan Dongle(3520-0511) . . . . . . 6-8
6.3.12 Power Supply Cable for Voltage Inversion Board (3520-
0512) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6.3.13 ECG internal connection cable (3520-0513) . . . . . 6-9
6.3.14 Foot Switch Cable (3520-0514) . . . . . . . . . . . . . 6-9
6.3.15 Composite Video BNC Cable (3520-0515) . . . . . . . 6-9
6.3.16 Main power cables from SMPS (3520-0520) . . . . . 6-10
7 Install and Update the System Software 7-1
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2 Applicable Models . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.3 Update Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.4 Non-kernel Level Update Instructions . . . . . . . . . . . . . . 7-3
7.4.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.4.2 Non-kernel Level Software Update Procedures . . . . 7-4
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7.5 Upgrade Kernel and Software . . . . . . . . . . . . . . . . . . 7-5
7.5.1 Upgrade Using USB Boot-up Disk . . . . . . . . . . . . 7-5
7.5.2 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.5.3 Upgrade Procedures . . . . . . . . . . . . . . . . . . . . 7-5
7.5.4 Activate the Micro-SCAN function . . . . . . . . . . . 7-10
8 System Functionality Tests 8-1
8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2 Testing Software . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2.1 Speaker Test . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.2 System memory . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.3 TFC test . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.4 ECFIFO . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.5 Receive bus . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.6 Detector to FIFO . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.7 ADC Test (Rx on) . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.8 Probe ID, HV and Temp . . . . . . . . . . . . . . . . . . 8-3
8.2.9 ADC Test (Rx off) . . . . . . . . . . . . . . . . . . . . . 8-3
8.2.10 Receive Channel Test . . . . . . . . . . . . . . . . . . . 8-3
8.2.11 Single Element Test . . . . . . . . . . . . . . . . . . . . 8-3
8.3 Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
8.3.1 Run Test 8.2.1 (Speaker Test) . . . . . . . . . . . . . . 8-4
8.3.2 Run Tests from 8.2.2 and 8.2.9 . . . . . . . . . . . . . 8-5
8.3.3 Run Tests from 8.2.10 to 8.2.11 . . . . . . . . . . . . . 8-5
8.4 Key Simulation Test . . . . . . . . . . . . . . . . . . . . . . . . 8-6
8.5 Real-time Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
9 Supported Peripherals 9-1
9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.2 Thermal Printer Installation . . . . . . . . . . . . . . . . . . . 9-1
9.3 Network Printer Installation . . . . . . . . . . . . . . . . . . . 9-2
9.3.1 Supported Models (Not Exhaustive) . . . . . . . . . . 9-2
9.3.2 Configurations . . . . . . . . . . . . . . . . . . . . . . . 9-2
9.3.3 Network Connection with PC . . . . . . . . . . . . . . 9-7
10 System Troubleshooting 10-1
10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.2 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.3 Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
10.3.1 Basic Functional Tests . . . . . . . . . . . . . . . . . . . 10-2
10.3.2 Functional Test for Critical Parts . . . . . . . . . . . . 10-3
10.4 Common Problems and Service Instructions . . . . . . . . . . 10-4
10.4.1 Repairing Procedures . . . . . . . . . . . . . . . . . . . 10-5
10.4.2 Problem Analysis . . . . . . . . . . . . . . . . . . . . . 10-6
11 System Maintenance 11-1
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11.1 Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11.2 Host Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11.3 Probe Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
11.4 Cleaning and Disinfecting Probes . . . . . . . . . . . . . . . . 11-4
11.4.1 Cleaning Probes . . . . . . . . . . . . . . . . . . . . . . 11-4
11.4.2 Disinfecting Probes . . . . . . . . . . . . . . . . . . . . 11-4
A Make a Bootable USB Key A-1
A.1 Make bootable key directly through PC . . . . . . . . . . . . . A-1
B Cables & Wires Inside the System B-1
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Chapter 1

Introduction

This manual describes the information for servicing and maintaining of the S6 Portable Digital Color Doppler Ultrasound System. Please read the Service Manual carefully before servicing/maintaining the equipment. Pay special attention to chapter 2 which is on safety issues.

1.1 Intended Users

The intended users of this manual are the Service Engineers trained and authorized by SonoScape Co., Ltd.
Warning!
Only Service Engineers trained and authorized by SonoScape can perform service and repairs for the equip­ment.

1.2 Contact Information

SonoScape values the customer’s feedback, please feel free to contact us.
Contact Information:
Address: 4/F., Yizhe Building, Yuquan Road, Shenzhen,
P.R. China
Zip Code: 518051 Tel: 400–678–8019 Fax: 86–755–26722850 Website: http://www.sonoscape.com E-mail: service@sonoscape.net
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1.3 Software Updates

SonoScape may provide software updates to enhance the performance of the system. The Service Manual will be updated accordingly, please contact our service department to get the latest edition.
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Chapter 2

Safety Considerations

2.1 Introduction

This chapter describes the safety precautions that must be observed dur­ing all phases of operation, service and repair of the equipment. For hu­man safety, please read this chapter carefully before using or servicing the equipment.
Warning!
Please pay due attention to the items with this warning icon. Dismissing these warnings may cause serious personal injury or even endanger human life.
Attention!
The items with this caution icon describe the precautions necessary to protect the system. Failure to observe these precautions may cause system damage.
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2.2 Symbol Used

SSI-8000 Mobile Digital Color Doppler Ultrasound System
Service Manual
Off (Mains power switch OFF)
SSI-8000 Mobile Digital Color Doppler Ultrasound System
Service Manual
Off (Mains power switch OFF)
On (Mains power switch ON)
SSI-8000 Mobile Digital Color Doppler Ultrasound System
Service Manual
Off (Mains power switch OFF)
On (Mains power switch ON)
Protective earth/ground connection.
SSI-8000 Mobile Digital Color Doppler Ultrasound System
Service Manual
Off (Mains power switch OFF)
On (Mains power switch ON)
Protective earth/ground connection.
Potential equilibrium connection
SSI-8000 Mobile Digital Color Doppler Ultrasound System
Service Manual
Off (Mains power switch OFF)
On (Mains power switch ON)
Protective earth/ground connection.
Potential equilibrium connection
AC
S6 Portable Digital Color Doppler Ultrasound System
Service Manual
Symbol
Description
Insulated patient application part (Type BF)
Dangerous electric voltage Warning! Follow these instructions to avoid personal injury or system damage.
Attention! Follow these instructions to avoid system damage.
Off (Mains power switch OFF)
On (Mains power switch ON)
Protective earth/ground connection.
Potential equilibrium connection AC
Table 2.1: Table of Symbols
These symbols (icons) listed in table 2.1 are used with the equipment and/or within this manual. They serve as warnings, or for marking con­nections and etc.

2.3 Electrical Safety

• The equipment conforms with the following regulations for electrical safety,
– IEC 60601-1: 1988+A1:1991+A2:1995, Medical Electrical Equip-
ment Part 1: General Requirements For Safety, Class I, BF, con­tinuous operation
– IEC 60601-2-37: 2001 + A1:2004 + A2:2005, Medical Electri-
cal Equipment Part 2-37: Particular Requirements For The Safety Of Ultrasonic Medical Diagnostic And Monitoring Equipment
• The equipment conforms with the following EMC/EMI standards: IEC60601-1-2: 2001+A1: 2004, Class A (CE)
• Degrees of protection against harmful liquid: IPX0 for the S6 system and IPX7 for the accompanying probes.
Please comply with the following rules for safety considerations:
• Properly grounding the system can prevent potential electric shock, ensure that the three-conductor AC power cord equipped with the system is plugged into an electrical outlet/receptacle marked with hospital grade. The equipment has an extra grounding point (located
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at the lower rear panel). To avoid loss of image quality, it is compul­sory to connect this point to ground (earth).
• Potentially hazardous electrical voltage exists inside the equipment. Unauthorized personnel DONOT attempt to open the cover of the equipment.
• The equipment must not be used in the presence of inflammable gases (e.g. anesthetic gases and nitrous oxide) to avoid explosion hazard.
• Devices must be powered from a receptacle marked "hospital grade" before being connected to the system directly. In case "hospital grade" receptacles are not available, use isolation transformers instead.
Warning!
Electrostatic discharge (ESD) may cause electric shock or damage the equipment. Observe the following precautions:
1. Prior to repairing or cleaning the equipment, ensure that the system has been turned off and the power ca­ble unplugged.
2. The equipment must be grounded correctly during op­eration. Use anti-ESD spray on the ground if possible.
• The leakage current of the entire system including all auxiliary equip­ments must not exceed the limit as stated in IEC 60601-1.
• The equipment may interfere with or be interfered by other high fre­quency devices (e.g. medical lasers). Extra safety measures must be taken if other HF devices have to be used nearby.
• Use the couplant shipped with the equipment or any other couplant recommended by SonoScape. Use any unrecommended couplant may damage the probe and void the warranty.

2.4 Mechanical Safety

1. Prior to using the equipment, place it horizontally and lock the wheels.
2. Take care when moving the equipment. Failure to follow the pre­cautions listed below could result in injury, uncontrolled motion and costly damage.
Take the following precautions before transporting the system:
1) Ensure that the system is powered off and with power cable un­plugged.
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2) Disconnect all the probes from the system and place them in their carrying case.
3) Ensure that all the peripherals and auxiliary devices have been disconnected from the system.
4) If you are moving the docking cart together with the S6 system, unlock the wheels.
5) Now you can hold the handle and push the system to the des­tined place.
If the system is to be transported for long distance, take the fol-
lowing precautions as well:
6) It’s highly recommended to backup the critical data (e.g. patient data and images) to a DVD/CD or hardcopy.
7) Ensure that the system is well prepared and packed in its original packaging before transporting.
8) Place the system upwards, and ensure that it is firmly secured while inside the vehicle during transport.
Warning!
Avoid collisions and excessive vibrations to prevent data loss or system malfunction.
Never move the equipment which is still operating.
Environmental Conditions for Transportation:
Relative Humidity: 20% to 90%, no condensation Temperature: -20°C to 55°C Barometric Pressure: 700 to 1060hPa

2.5 Human Safety

Modern diagnostic ultrasound system has been proved to be safe for daily diagnostic usage, however, only the well trained/educated medical person­nel should operate the equipment. The ALARA (As Low As Reasonably Achievable) principle must be observed. The following are some more de­tailed guidelines on safety use of the equipment.
• Keep the power levels and the exposure time as low as possible, as long as a satisfactory diagnosis has been achieved.
• Use the freeze function or move the probe away from the patient while not scanning.
• Do not rest the transducer on the skin surface when not scanning.
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• The imaging system of S6 is based on Doppler and Color Doppler Imaging. The output power of the ultrasound is lower than the limits as required by the standard IEC 60601-1.
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Chapter 3

Description of the System

3.1 Product Description

The S6 is a professional, general purpose portable color Doppler diagnostic ultrasound system. It employs digital technology and fully exploits the potential of integrated circuits. The software is based on Linux system, which enhances the stability and efficiency while maintains the portability. The user interface has been optimized for ease of use. The imaging system can be adjusted during the scanning process; while for advanced users, the system configurations can be changed quite intuitively. A wide range of probes make the system suitable for many applications. To keep the system up to date, the software updates are provided regularly. To enhance the system performance even more, users may also take the hardware upgrade service provided by SonoScape. There are a variety of upgradeable options available.
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S6 Portable Digital Color Doppler Ultrasound System
3.2 System Configuration
Overview of the S6 System
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Front View
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Side View
S6 Portable Digital Color Doppler Ultrasound System
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1 Audio Out 2 S-Video Socket 3 Two USB Ports 4 Ethernet Port 5 VGA Port
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Rear View
1 2
3 4
5 6 7
8
9
S6 Portable Digital Color Doppler Ultrasound System
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1 Probe Connection Port 1 6 ECG Port 2 Probe Connection Port 2 7 Equipotential point (earth) 3 Video Printer Controller Port 8 Power Switch 4 Foot Switch Socket 9 Power Input Socket 5 Video Out

3.3 Applications

The S6 system, with a wide range of probes available, is extremely versa­tile. This section introduces the applications that the S6 system is suitable for.
6
Small organs (breast, thyroid, testicle and etc.)
6
Vascular
6
Abdomen (liver, spleen, cholecyst, kidney and etc.)
6
Obstetric
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6
Gynecology and fertility
6
Cardiology
6
Urology
6
Musculoskeletal
Note: The application fields are dependent on the probe in use.
Warning!
The S6 system is not intended for ophthalmic use or any use
causing the acoustic beam to pass through the eye.

3.4 Operating Modes

6
B Mode
6
B FLOW
6
Tissue Harmonic Imaging (THI)
6
M Mode
6
Color Doppler Imaging (CDI or CFM)
6
Power Doppler Imaging (DPI)
6
Directional Power Doppler Imaging (DDPI)
6
Pulsed Wave Doppler Imaging (PW)
6
Continuous Wave Doppler Imaging (CW)
6
Tissue Doppler Imaging (TDI)

3.5 Combined Modes

The system provides the following Duplex modes with some in dual display format.
Notations: Left means left screen, Up means upper screen. Similar for Right and Down, e.g., Left B+COLOR, Right B implies that the left screen is of duplex mode, B and CFM, and the right screen is of B mode.
6
Left B, Right B
6
Left B+COLOR, Right B;
6
Left B+COLOR, Right B+COLOR
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S6 Portable Digital Color Doppler Ultrasound System
6
Up B, Down M
6
Up B, Down PW/CW (real time)
6
Up B+COLOR,Down PW/CW
6
Up B+COLOR, Down PW/CW (real time)
6
Up B+COLOR, Down PW/CW (real-time refreshing)
6
Color+M

3.6 Scanning Modes

6
Electronic linear array scanning
6
Sector curved array (convex) scanning
6
Sector phased array scanning
Service Manual
6
Trapezoid linear scanning

3.7 Adjustable Parameters

Users can change these parameters during the scanning process to get the best image quality.

3.7.1 B Mode

Image Parameters:
6
Bandwidth: 1 to 15MHz
6
Maximum Depth: 32.9cm
6
Sector Width/Angle: 10 to 193 degrees
6
Sector Position: adjustable in imaging area
6
Zoom: magnification factor>10
6
Power: 1% to 100%
6
2D Gain Range: 1 to 255
6
TGC: adjustable for 8 different depth
6
Sound Volume Adjustable
6
Focal Zones: 1 to 9 focal zones may be chosen, with focal distance adjustable.
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S6 Portable Digital Color Doppler Ultrasound System
6
Persistence range: from 0 to 95, may vary with the probes
6
Line Density: 3 level adjustable (high/medium/low)
6
Chroma: 13 different colors available
6
Adaptive Image Fusion: 6 level adjustable
6
Tissue Characteristic Index: adjustable from 1400 to 1700
6
Image Orientation: flip vertically and/or horizontally

3.7.2 Spectral Doppler (PW/CW)

Image/Video Parameters
6
Video inversion
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6
Flow Inversion
6
Sweep Speed: 4 level adjustable
Signal Processing
6
Dynamic Range: 5 level adjustable
6
Chroma: 5 different colors available
6
D Gain: adjustable from 1 to 255
6
Doppler Angle Correction: adjustable from -80 to 80 degrees
6
Sound Volume Adjustable

3.7.3 Color Doppler and Power Doppler

Signal Processing
6
D Gain: adjustable from 1 to 255
6
Persistence Range: 0 to 80 (also depends on the probe in use.)
6
Color Mapping: 4 options available
6
B-Reject Range: from 0 to 255
6
Baseline: 31 level adjustable.
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S6 Portable Digital Color Doppler Ultrasound System

3.7.4 Archive and Backup

6
160G HDD (Hard Disk Drive)
6
Image/Video Format: The system supports local format (PPM and CIN) and PC format (JPEG, BMP, TIF, AVI and WMV) and offers the function of conversion from local format to PC format.
6
Cine Playback: More than 1 minute video supported.
6
Accessing local cine files remotely through Ethernet is supported.
6
Data storage using external disks (USB and DVD/CD) is supported.
6
Video output: S-VIDEO/ VGA

3.8 Measurements and Calculations

Service Manual
Measurements Functionality
6
Measurements can be performed either during real-time scanning or in freeze mode.
Measurements and Calculations for 2D Image
6
Length measurements: straight line, ellipse and perimeter of any other arbitrary shapes
6
Area measurements: ellipse, rectangular and area of any other arbi­trary shapes
6
Volume measurements
6
Doppler area
6
Calculation and measurement in gynecology and fertility applications.
6
LV (Left-Ventricular) measurements and calculations
Available LV Calculation Methods:
Single Plane Ellipse
Biplane Ellipse
Bullet
Simpson
Cube
Teichholz
Gibson
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S6 Portable Digital Color Doppler Ultrasound System
M Mode
6
Distance
6
Time
6
Slop
6
HR (Heart Rate)
6
LV (Left-Ventricular) measurements and calculations
Available LV Calculation Methods:
CUBE
TEICHHOLZ
GIBSON
Mitral Valve
Service Manual
Aortic Valve
4D Analysis Software
Doppler Image
6
Length measurements: straight line, perimeter of ellipse and any other arbitrary shapes.
6
Area measurements: area of rectangular, ellipse and any other arbi­trary shapes.
6
Blood flow velocity and acceleration
6
Time
6
Cardiac measurements: Mitral Valve, Aortic Valve, Tricuspid Valve, Pulmonary Valve, TEI index
Report Functionality
6
Cardiac
6
OB/GYN
6
Fetal
6
Vascular
6
Urology
P/N: 4720-0034-01A
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S6 Portable Digital Color Doppler Ultrasound System
Service Manual
P/N: 4720-0034-01A
3-10
S6 Portable Digital Color Doppler Ultrasound System
Service Manual
Chapter 4

Principle of the S6 System

4.1 Introduction

This chapter provides the functional explanations of the electronics of the S6 system.

4.2 System Block Diagram

Figure 4.1: Block Diagram of the S6 System
The DBTR board has the following functionalities: Control the timing and band width of the emitted ultrasound; Amplify the variable gain of the echoes; Adjust the electronic focus position, TGC, dynamic filtering, loga­rithmic compression, demodulation and other signal processing functions.
The echo signals are transmitted to the computer and the DBF board. The DBF board serves for extracting the Doppler signals from the echo sig­nals, and sends the output signals to the computer system. After processed
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S6 Portable Digital Color Doppler Ultrasound System
Service Manual
through the computer system, the signals are sent to the graphics card and then to the display (e.g. LCD monitor).
The computer system is the core control unit of S6. Following user in­structions from the keyboard, it controls the operating modes and adjusts the status of the system. The computer system is also responsible for the display of diagnostic data, calendar, time and etc.

4.3 Principle of Probes

The transducer provides conversions between ultrasonic and electronic sig­nals. At the start of a scanning process, the probe first converts the elec­tronic excitation signals to ultrasonic vibrations. The ultrasonic vibrations (or ultrasound) propagate into the body of the patient; and the echoes are picked up by the probe. Electronic signals converted from these echoes are sent back to the computer system or the DBF board for further processing. The acousto-electric conversion efficiency and the ultrasound focusing abil­ity are the key features that are vital to the system’s performance, such as resolution, maximum scanning depth.

4.4 Operating Modes

This section gives brief explanations of the principles of the scanning modes of the S6 system.
M Mode
Primarily applied in cardiology, M mode provides Time and Motion echo information derived from a stationary ultrasound beam. It records moving anatomical structures and produces subtle patterns of motion.
2D/B Mode
B mode image, also called 2D image, provides a cross sectional view of tissues. The ultrasound image is derived from the tissue echoes that re­ceived by the probe. Each echo’s intensity is mapped to a shade of gray; and the location that the echo occurs is mapped to a unique point on the screen. Except for linear array probes which produce rectangular images, most probes produce fan shaped images.
Spectral Doppler(PW/CW)
The spectral Doppler mode detects the movements of red blood cells based on the Doppler principle. The moving cells reflect the ultrasound sent by the probe. The echoes are frequency shifted (phase shift are detected for PW mode) as a result of Doppler Effect. The spectral distribution of the echoes reveals details of the blood flow: red (blue) shift implies flow away from (towards) the probe head. The pulsed wave mode (PW) is normally applied at detecting low flow velocity, while the continuous wave mode (CW) is normally for measuring high speed blood flow.
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S6 Portable Digital Color Doppler Ultrasound System
Service Manual
Color Flow Mode (CFM)
CFM (Color Flow Mode) is also called CDI (Color Doppler Mode) some­times. CFM combines 2D grayscale imaging with color imaging. The 2D imaging gives information on tissues; the color imaging, which uses the Doppler principle, gives information on blood flow. The output is the color image overlaid with the 2D grayscale image.
Power Doppler (DPI)
The color image in Power Doppler Imaging (DPI) is in principle different from that in CFM. DPI analyzes amplitude shift, while CFM analyzes fre­quency shift. The color image is overlaid onto the 2D grayscale image which gives information on tissues. DPI is capable of detecting low speed blood flow.
A high pass filter (wall filter) is used to remove the signals from stationary or slowly moving structures. Tissue motion is discriminated from blood flow by assuming that blood is moving faster than the surrounding tissue, although additional parameters may also be used to enhance the discrimi­nation. The power in the remaining signal after wall filtering is then aver­aged over time (persistence) to present a steady state image of blood flow distribution.

4.5 Functional Boards/Units of the S6 System

Besides the probes, the S6 system consists of the following critical func­tional boards/units.
6
MPC board: Also called probe board. Two probes can be connected at the same time and one of them active (scanning).
6
DBTR board: It has an emitting pulse synthesizer and a receiving signal preamplifier/TGC. The DBTR sends electronic signals to drive the probes and pre-amplifies the echoes.
6
DBF board: It converts analog signals to digital signals and sends the signals for digital beam forming (DBF). DBF board also has scan controller, front end controller, demodulation unit and USB ports.
6
DBHV board: It provides the high voltages for the pulse generator and the low voltages for other system units. The ECG and 4D motor units are also on this board.
6
PC Motherboard: It is the core data processing unit of the S6 system.
6
Power supply: ATX SMPS power supply. It provides stable power supply to the whole system (probes, host and LCD monitor).
6
User Keyboard: hard keys, trackball, flip switches and knobs.
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S6 Portable Digital Color Doppler Ultrasound System
DBF Board
7500-0821-XX
DBTR Board
7500-0820-XX
DBHV Board
7500-0822-XX
KEAA board
7500-3039-XX
Motherboard
2101-0008
Power Supply HDD
Monitor
KBD board
7500-0813-XX
USB Cable
Power Calbe
IDE Cable
PS2 Cable
S
A
TA
C
a
b
l
e
P
o
w
e
r
Ca
b
l
e
Printer
Loudspeaker
Cable
Printer Cable
F
o
ot
S
w
i
t
ch
C
ab
l
e
Loudspeakers
Foot Switch
VGA Cable
Voltage
Conversion Board
P
o
w
e
r
C
a
b
l
e
Fan
P
o
w
e
r
C
a
b
l
e
VIDEO
OUT
D
a
t
a
C
a
b
l
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ECG
D
a
t
a
C
a
b
l
e
Power Cable
P
o
w
e
r
C
a
b
l
e
6
Monitor: 15 inch LCD
6
Loudspeakers: Serve as Doppler audio device.

4.5.1 Functional Block Diagram

Service Manual
Figure 4.2: Functional Block Diagram

4.5.2 Explanations of the System Functions

The electronic pulse signals are sent to the DBTR board from the RAM of the DBF board. After processing, DBTR sends the HV signals to drive the piezo oscillator in the probe. The probe emits the ultrasonic sounds to­wards patient, and also picks up the echoes. The signals are then processed by the front end amplifier and the TGC, both on the DBTR board. At the same time, the DBF board converts the analog signals to the digital signals, utilizes the digital dynamic receive focusing and dynamic tracing technolo­gies, and then demodulates. With some further processing, the signals carrying image information are transmitted to the computer through high speed USB2.0 connection. The computer processes the image data, and the tissue and/or blood flow information is displayed on the screen. The computer also takes user inputs from the keyboard, and sends the control signals to the DBF board through USB2.0 port. Peripherals and Ethernet ports are available on the Motherboard. The switching power supply for medical use provides 12V and 5V DC outputs to other system units/boards. The DBHV board supplies 90V DC and the low voltages for other digital and analog circuits.
P/N: 4720-0034-01A
4-4

4.6 Part List

S6 Portable Digital Color Doppler Ultrasound System
Service Manual
Part No. Name
7500-0826 MPC 7500-0820 DBTR
7500-0821 DBF
7500-0822 DBHV
7500-0815 KBD
7500-3039 KEAA
2101-0008 PC Motherboard
2101-0152 HDD
3900-0012 LCD Monitor
NA
Voltage Inversion Board
Quantity
1 1
1
1
1
1
1
1
1
1
Description
Probe connection PCB board Emission/Reception PCB board PCB board for receiving digital beam forming and signal pro­cessing PCB board providing high volt­ages Keyboard PCB board KEAA board serves as a hub for interconnecting other PCB boards. It is the central control unit for data processing and video/audio output. 160G hard disk drive Designed exclusively for medical use Provides high voltage source for LCD.
P/N: 4720-0034-01A
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S6 Portable Digital Color Doppler Ultrasound System
Service Manual
P/N: 4720-0034-01A
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