|Brachytherapy QA Phantom.|
Part of a complete solution as described by AAPM TG128|
A robust quality assurance prostate brachytherapy QA program is essential to ensure accurate image guidance and dosimetry calculations. The CIRS Model 045A used in conjunction with the CIRS Model 053G Ultrasound Prostate Phantom offers a complete solution for implementing a QA program specific to transrectal ultrasound used for guidance of prostate brachytherapy as recommended by AAPM Task Group 1281.
The Model 045A enables users to check key imaging parameters such as depth of penetration, axial and lateral resolution, distance measurements, area measurements, volume measurements and geometric consistency with the treatment planning computer.
When scanning towards the top of the phantom, a partial grid of wires appears. This N-shaped pattern should line up with the electronic grid that appears on your screen thus ensuring correct vertical and horizontal distance measurements. This target group can also be used to assess axial and lateral resolution of the system. Five cross wires are embedded within the phantom to determine if the probe is being retracted by the stepper system by the specified distance.
Turn the probe 60 degrees to the right or left to visualize and measure the volume of three different calibrated objects, one of which is non-spherical.
-Depth of penetration
-Distance, area and volume measurements
Model 045A Specifications:
Dimensions: 6" X 4.5" X 4.5" (15.2cm X 11.4cm X 11.4cm)
Phantom Weight: 4lbs (1.5kg)
Zerdine® 2 solid elastic water-based polymer.
Freezing Point: 0°C
Melting Point: Above 100°C
Attenuation Coefficient: 0.50 dB/cm-MHz
Velocity of Sound Through Background Medium: 1540 m/s ± 10 m/s
Probe Retraction Assessment...|
Material: Nylon MonofilamentVolumes...
Number of Targets: 5
Spacing: 0.5cm and 1.0cm
Position: Along Row 4
Material: Zerdine® 2 solid elastic water-based polymer.
Sizes: Approximately 4cc (S), 9cc (M), and 20cc (L). Measured volumes provided on certificate of compliance.
Contrast: Brighter than background.
(1) Pfeiffer, Douglas, et al., AAPM Task Group 128: Quality assurance tests for prostate brachytherapy ultrasound systems. Med. Phys., vol. 35 (12). pgs. 5471-5489, December 2008.
(2) US PATENT# 5196343
Complete your QA solution by also purchasing the Model 053G Ultrasound Prostate Phantom. The Model 053G can be used to verify alignment of the physical needle template with the electronic grid.