Transcript IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY Part 19.02: Optimization of protection in Mammography Practical.

IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
RADIATION PROTECTION IN
DIAGNOSTIC AND
INTERVENTIONAL RADIOLOGY
Part 19.02: Optimization of protection in
Mammography
Practical exercise
IAEA
International Atomic Energy Agency
Overview
• To be able to apply quality control protocols
to mammography equipment
• To measure the compression force applied
to the breast
• To measure the compression device
alignment at maximum force
• Interpretation of results
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19.02 : Optimization of protection in Mammography
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IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Part 19.02: Optimization of protection in
Mammography
Compression test
IAEA
International Atomic Energy Agency
Compression force
• The compression force can be measured
with a compression force test device or a
bathroom scale (use compressible material,
e.g., a tennis ball, to protect the bucky and
compression device)
• When compression force is indicated on the
console, it should be verified whether the
figure corresponds with the measured value
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Compression force test device
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Compression force
Limiting value :
Maximum automatically
applied force: 130 - 200
N (~ 13-20 kg)
Frequency :
Annually
Equipment :
Compression force test
device
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Compression plate alignment
• The alignment of the compression device at
maximum force can be visualized and
measured when a piece of foam-rubber is
compressed
• Measure the distance between bucky
surface and compression device on each
corner. Ideally, those four distances should
be equal
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Compression plate alignment
• Misalignment normal to the chest wall side is
less disturbing than in the parallel direction.
The upright edge of the device must be
imaged outside the receptor area and
optimally within the chest wall side of the
bucky
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Compression plate alignment
Limiting value : Minimal misalignment is
allowed,
< 15 mm is acceptable
for asymmetrical load and in
the direction towards the
nipple
< 5 mm for symmetrical load
Frequency :
Annually
Equipment :
Compression measurement
device, foam rubber, tape measure
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Where to Get More Information
European protocol for the quality control of the
physical and technical aspects of mammography
screening.
http://euref.org/index.php?option=com_phocado
wnload&view=category&id=1&Itemid=8
American College of Radiology Mammography
Quality Control Manual, Reston VA, 1999.
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