Fluke 660-6 User Manual
Victoreen®
660-6
500-100
6000-100
660-7 & 660-8
CT Probes and Phantoms
March 2005
Manual No. 660-6-1 Rev. 3
©2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies
Operators Manual
Fluke Biomedical
Radiation Management Services
6045 Cochran Road
Cleveland, Ohio 44139
440.498.2564
www.flukebiomedical.com/rms
Table of Contents
Section 1: Introduction................................................................................................ 1-1
1.1 Product Description ..................................................................................... 1-1
1.2 Specifications............................................................................................... 1-1
1.2.1 CT Probes .............................................................................................. 1-1
1.2.2 Phantoms ............................................................................................... 1-5
1.3 Receiving Inspection.................................................................................... 1-5
1.4 Storage ........................................................................................................ 1-5
Section 2: Theory of Operation................................................................................... 2-1
2.1 Theory of Operation..................................................................................... 2-1
Section 3: Operation.................................................................................................... 3-1
3.1 Operation ..................................................................................................... 3-1
Section 4: Probe Calibration....................................................................................... 4-1
4.1 Probe Calibration ......................................................................................... 4-1
Appendix A: Radiation Dosimetry in Computed Tomography .................................... A-1
A.1 Radiation Dosimetry in Computed Tomography .......................................... A-1
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Introduction
Product Description
Section 1
Introduction
1.1 Product Description
CT Probes, Models 660-6, 500-100, and 6000-100 are designed to be used with Phantoms, Models 6607 and 660-8, to measure exposure produced by Computed Tomography (CT) Scanners.
The probes (Figure 1-1) consist of a pencil type ionization chamber with a sensitive length of 10.0 cm.
The Model 660-6 probe chamber is connected, via 0.9 m (3 ft.) of low noise flexible cable, to a signal
digitizing pre-amplifier. It is designed to be readout on a Model 660 Digital Exposure Meter. The Model
500-100 probe chamber is connected to 0.9 m (3 ft.) of low noise flexible cable terminated with a male
BNC size triaxial connector. It is designed to be readout on a quality electrometer. Model 600-100 (notshown) is similar to the Model 500-100, but designed for the NERO™
The phantoms (Figure 1-2) are designed in accordance with the definition in the FDA Center for Devices
and Radiological Health, performance standard 1020.33 Computed Tomography (CT) equipment, “NCT
Dosimetry Phantom”. Model 660-7 is a body phantom; Model 660-8 is a head phantom.
1
1.2 Specifications
1.2.1 CT Probes
Detector Type
Volume
Sensitive Length
Chamber Material: Clear Acrylic
Electrode Material: Aluminum
Sensitivity
Factory Calibration
Energy Response
Beam Orientation
Phantom Adapter Outside Diameter: 1.27 ± 0.04 cm (0.50 ± 0.015 in)
Model 66O-6
(with Model 660
Readout)
Vented air ionization chamber
3.2 cc
10.0 cm
Inside Diameter: 6.4 mm
Wall Thickness: 54 mg/cm
Diameter: 0.64 mm
10 R cm/nC (nominal)
100 KVCP, 5.5 mm Al hvl
+5%, 1 mm Al to 10 mm Al hvl (see Figure 1-3)
Uniformity (along axis): + 3% over central 90% of active
length (see Figure 1-4)
Normal to chamber axis
Maximum Display: 999 R cm/min, 99.9 R cm
Maximum Resolution: 0.01 R cm/min, 0.001 R cm
2
1-1
Victoreen 660-6,660-7,660-8,500-100,6000-100
Operators Manual
Figure 1-1. Model 660-6 and Model 500-100 CT Probes
1-2
Figure 1-2. Model 660-7 and Model 660-8 Phantoms
Introduction
Specifications
1
Figure 1-3. CT Probe Energy Response (Phantom Adapter Removed)
1-3
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