MAMMOMAT Balance
SP
Start-up
Print No.: SPB7-115.815.01.02.02
Replaces: SPB7-115.815.01.01.02
© Siemens AG 2004
The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or_ design,_are_ reserved.
English
Doc. Gen. Date: 10.04
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Document revision level
The document corresponds to the version/revision level effective at the time of system delivery. Revisions to hardcopy documentation are not automatically distributed.
Please contact your local Siemens office to order current revision levels.
Disclaimer
The installation and service of equipment described herein is to be performed by qualified personnel who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or one of its affiliates to provide such services.
Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are directed to contact one of the local offices of Siemens or one of its affiliates before attempting installation or service procedures.
MAMMOMAT Balance |
SPB7-115.815.01 |
Page 2 of 26 |
Siemens AG |
Start-up |
Rev.02 |
10.04 |
Medical Solutions |
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Contents |
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GENERAL INFORMATION |
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REQUIRED DOCUMENTS......................................................................................................................... |
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REQUIRED TOOLS, MEASUREMENT AND AUXILIARY DEVICES ....................................................................... |
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PRELIMINARY ....................................................................................................................................... |
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MANUAL MODE CHECK....................................................................................................................... |
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-KV CHECK .......................................................................................................................................... |
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-MA CHECK.......................................................................................................................................... |
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-MAS CHECK ........................................................................................................................................ |
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AUTOMATIC MODE CHECK................................................................................................................ |
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THINGS TO KNOW BEFORE TO START ........................................................................................................ |
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2. MAMMOGRAPHY SYSTEM........................................................................................................................ |
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3. SELECTING FILM/SCREEN COMBINATION.................................................................................................. |
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FILM PROCESSOR ................................................................................................................................. |
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PROCEDURE PREPARATION............................................................................................................. |
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1. SOFTWARE INSTALLATION .................................................................................................................... |
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2. DEVELOPER ....................................................................................................................................... |
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X-RAY CASSETTE FOR TESTS |
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FILM PACK FOR TESTS ......................................................................................................................... |
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TEST DUMMY...................................................................................................................................... |
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6. O.D. REFERENCE X-RAY ...................................................................................................................... |
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TIME FOR CARRYING OUT PROCEDURE .................................................................................................. |
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ANODE FILTER COMBINATION............................................................................................................... |
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9. DETECTOR CALIBRATION ..................................................................................................................... |
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10. OFFSET [O] CALIBRATION............................................................................................................ |
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11. DETECTOR [R] GAIN CALIBRATION ............................................................................................. |
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12. CONNECTING PC FOR CALIBRATION.................................................................................................... |
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13. SELECTION OF TEST LAYERS................................................................................................................ |
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14. OTHER TECHNIQUES AND OPERATING MODES ...................................................................................... |
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15. AUTOMATIC MOLIBDENUM RHODIUM FILTER....................................................................................... |
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16. MODIFICATION OF THE REFERENCE DENSITY AFTER CALIBRATION .......................................................... |
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17. MAXIMUM BREAST DENSITY LIMIT........................................................................................................ |
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18. CALIBRATION CONCEPT ..................................................................................................................... |
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19. LINEARITY CHECK ............................................................................................................................. |
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20. UNUSED OPERATING TECHNIQUE AND FILM SCREEN ............................................................................ |
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21. DISABLING SPECIFIC OPERATING TECHNIQUE AND/OR FILM SCREEN...................................................... |
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CALIBRATION PROCEDURE.............................................................................................................. |
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MAMMOMAT Balance |
SPB7-115.815.01 |
Page 3 of 26 |
Siemens AG |
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Start-up |
Rev.01 |
06.04 |
Medical Solutions |
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Contents |
1. ZERO POINT CALIBRATION ................................................................................................................... |
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2. MANUAL DENSITY STEPS...................................................................................................................... |
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3. ONE POINT CALIBRATION ..................................................................................................................... |
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4. RHODIUM FILTER................................................................................................................................ |
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5. MAXIMUM BREAST DENSITY LIMIT ......................................................................................................... |
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6. AEC CALIBRATION FILES BACKUP ......................................................................................................... |
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CHANGES TO PREVIOUS VERSION .................................................................................................. |
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MAMMOMAT Balance |
SPB7-115.815.01 |
Page 4 of 26 |
Siemens AG |
Start-up |
Rev.01 |
06.04 |
Medical Solutions |
General Information
General Information
1. Required documents
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Installation and Start-up Instructions |
SPB7-115.814.01…. |
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Instructions for use |
SPB7-115.629.01…. |
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Service Instruction |
SPB7-115.840.01…. |
2. Required tools, measurement and auxiliary devices
∙Oscilloscope
∙Oscilloscope probe 1:100 > 600Vdc
∙Digital multimeter
∙Non invasive kVp-meter (mammo)
∙Dosemeter (mammo)
∙Service PC with serial port (connection cable is supplied with the unit)
∙MAMMOMAT Balance SSW (Service Software Program is supplied with the unit)
∙SIB phantom or Normi 7 or 4 cm Plexi or customer phantom (supplied by customer)
∙Sensitometer / Densitometer
∙Film pack 18x24 and 24x30 if it occurs
∙Standard installation tools
∙Plexiglas phantom 2cm, 2cm, 2cm, 1cm, 0.5cm for AEC calibration (supplied with the unit)
3. Preliminary
During Start Up no calibrations are requested other than AEC linearity.
Generator functionality check and performances can be inspected according to the following essential procedure or more in detail following a specific QA protocol if requested in the specific country of installation.
AEC calibration software has online Help for software functions and calibration instructions.
MAMMOMAT Balance |
SPB7-115.815.01 |
Page 5 of 26 |
Siemens AG |
Start-up |
Rev.01 |
06.04 |
Medical Solutions |
Manual mode check
Manual mode check
Set Up the unit for “NORMAL BREASTS EXAMINATION” as described in the Operator’s manual . Select Manual mode, 28kV, 50mAs, put in place 4cm Phantom and take one picture with Large Focus and one with Small focus.
Measure O.D. on both films it must be identical, record operating conditions plus O.D. on each film and keep films in file for future reference.
1. -kV check
Remove compression paddle and potter bucky, select large focus and Mo filter if unit has automatic Mo/Rh filter and check kV with non invasive kVp meter.
If non invasive kVp meter is not available, check kV with DVM as described in Service Instruction SPB7-115.840.01….
For more details about kV check and/or eventual kV adjustment, refer to Service Instruction SPB7115.840.01….
2. -mA check
mA check/calibration is not necessary if no alarm “Low anode current” is generated after exposure. If necessary refer to Service Instruction SPB7-115.840.01….
3. -mAs check
mAs can be checked as product of mA by exposure time by means of oscilloscope connected to R16 of PCB 92-073 filament power supply.
More effective mAs check, can be performed as mAs/mGy ratio by means of external Dosemeter. For different mAs setting on the control panel record related dose in mGy and check that ratio remains constant within 5% maximum (max tolerance by IEC standard = 20% )
MAMMOMAT Balance |
SPB7-115.815.01 |
Page 6 of 26 |
Siemens AG |
Start-up |
Rev.01 |
06.04 |
Medical Solutions |
Automatic mode check
Automatic mode check
1. Things to know before to start
The unit has an Automatic Exposure Control (AEC) that is among the most advanced available on the market today.
Operation of the AEC is based on the effective breast density measured by means of a very short “pre-exposure” x-ray pulse.
This is the best way to operate the AEC exceeding performances of other systems only based on breast thickness evaluation.
The radiation [r] read by the detector during pre-exposure represent breast density and after being converted to a number that is inversely proportional to it, will be used in the process of exposure control that will continue in a completely numeric form, except for the Dose integration.
The above figure shows a time schematization of the exposure concept in ZERO POINT technique, with completely automatic kV and mAs.
The parameter [p] derived directly from the [r], the density of the breast being examined, is used as a pointer on two look-up tables containing the kV and mAs necessary for obtaining an image with the right blackening and contrast to fully satisfy any Quality Protocol in the Mammography field today.
A high value [p] corresponds to a LOW Density Breast and low values of kV and mAs are delivered. A low value [p] corresponds to a HIGH Density Breast and high values of kV and mAs are delivered.
kV values can’t be modified, but four different ranges are made available to the operator, with different kV profiles suited to different requirements that go beyond the possibilities offered by the well-known High Contrast (HC) and Low Dose (LD) techniques.
From the control panel, the operator can not only select the technique that he feels most suitable but he can also make fine-tuning in steps of 0.5kV on the kV range selected.
MAMMOMAT Balance |
SPB7-115.815.01 |
Page 7 of 26 |
Siemens AG |
Start-up |
Rev.01 |
06.04 |
Medical Solutions |
Automatic mode check
512 DIFFERENT TECHNIQUES AVAILABLE |
The above figure is a diagram of the operating possibilities of the DEATA PLUS software with Mo target / Mo filter or Mo target with automatic Mo/Rh filters.
The large number of Film Screen and techniques available have to be intended to give the possibility to tune the system to the specific requirements of any single or multiple user and or different film that can be momentarily found in critical markets without loosing the possibility to go back to the previously used when newly available.
2. Mammography system
Mammography unit, Film, X-ray Cassettes and Screen, Film Processor and Chemicals are the components that all together make up one SINGLE SYSTEM, the final product of which is the X-ray image.
To obtain a good X-ray image, each component of the SYSTEM plays a determining role and must be appropriately managed and integrated with all the others.
MAMMOMAT Balance |
SPB7-115.815.01 |
Page 8 of 26 |
Siemens AG |
Start-up |
Rev.01 |
06.04 |
Medical Solutions |
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