This document discusses quality assurance criteria for mammography x-ray equipment. It outlines various quality assurance tests that should be performed on mammography equipment to ensure optimum image quality with minimum radiation dose to patients. These include tests to check parameters like kilovoltage, milliampere-seconds linearity, output consistency, total filtration, leakage radiation and compression device calibration. Proper quality assurance is important for mammography equipment given its frequent use and to avoid unnecessary retakes and radiation exposure. The document provides detailed procedures and tolerances for each quality assurance test.
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1. Radiation Safety Training Module: Diagnostic Radiology
Quality Assurance Criteria for Mammography X-ray Equipment
Radiological Safety Division
Atomic Energy Regulatory Board
2. CONTENTS
• Expected questions to know after studying this lecture
• Objective/Aim of QA
• Mammography
• Parameters Affecting Image Quality in Mammography Equipment
• Quality Assurance Tests in Mammography Equipment
• Survey of the Mammography Installation
• Summary/Conclusion
• Questions and Answers
• References and sources for additional information
3. Expected questions to know after studying this lecture
• What do you mean by Quality Assurance in Mammography?
• Why the QA tests are required?
• Name of the QA tests for Mammography equipment ?
• How the leakage radiation of x-ray tube is measured?
• What do you mean of survey of Mammography x-ray installation and how
will you ensure whether Mammography x-ray installation is safe from
radiation safety view point?
4. Objective / Aim of Quality Assurance (QA)
Optimum image quality with minimum possible dose
to the patient
5. Why QA in Mammography?
• Frequent use and aging of the diagnostic X-ray equipment
may cause change in its functional characteristics.
• To avoid retakes which reduces the radiation exposure to patient and
radiological personnel and public.
7. Mammography is a specific type of
imaging unit that uses a low-dose
X-ray system to examine breasts.
What is Mammography
A mammography exam,
called a mammogram, is
used to aid in the early
detection and diagnosis of
breast diseases in women.
Digital
Mammogram
Normal
Mammogram
Mammography
X-ray unit
8. Development of Mammography
• In 1913, radiographic appearance of breast cancers was first
reported
• 1950’s – Industrial grade X-ray film used
• 1960’s – Xerography introduced – much lower dose
• 1975 – High speed/resolution film introduced
• 1992 – Mammography Quality Standard Test (MQSA)
implemented
9. Risk Vs. Benefit
• Mortality risk from mammography induced radiation is 5
deaths/1 million patients using screen film mammography. (Pl.
give reference)
• It is more risky to refuse mammography than to allow it.
10. Breast Cancer Screening
• American Cancer Society and American College of Radiology
suggest that all women over 50 years should undergo mammography
examinations annually.
• Women between 40 and 49 should have one mammography every or
every other year.
• A baseline mammogram should be done at the onset of menopause.
11. Tissue Equivalent Phantom
for Mammography
Al filter
Multi -parameter
measuring Instrument
Survey meter
Mammography X-ray unit
12. Parameters Tested are:
• Correspondence between X-ray Field and Image Reception Area
• Effective Focal Spot Size Measurement
• Accelerating Potential (kVp)
• Accuracy of Exposure Time
• Linearity of mA Loading Stations
• Linearity of Timer Loading Stations
• Radiation Out put consistency
• Total Filtration x-ray Tube
13. Cont…
• Calibration of Compression Device
• Imaging Performance Evaluation
• Constancy of the Automatic Exposure Control (AEC) on Film
Screen Receptors
• Radiation Leakage through Tube Housing and Collimator
14. 1. CORRESPONDENCE BETWEEN X-RAY FIELD
AND IMAGE RECEPTION AREA
• X-ray field to be positioned to cover the region of interest and
the sensitive volumes of the Automatic Exposure Control
• X-ray field is adjusted in normal use for full coverage of the
image reception area
• Result : within ______ mm
15. CORRESPONDENCE BETWEEN X-RAY FIELD AND IMAGE
RECEPTION AREA (Contd..)
Tolerance: The X-ray field
• shall extend to the edge of the patient support that is designed to be
adjacent to the chest wall of the patient and shall not extend beyond this
edge by more than 5 mm.
• shall not extend by more than 2% of the direct focal distance beyond all
edges of the image receptor area.
(IS13450(Part 2/Sec 45) :2007 Clause 29.203.4, page 22)
16. 2. EFFECTIVE FOCAL SPOT SIZE MEASUREMENT
The ability for resolving the smallest size of the image (i.e detail) in a radiograph depends on the focal
spot size.
Techniques for the measurement of focal spot
• Pin hole
• Slit
• Star pattern or resolution pattern
• Minimum focal spot to skin distance is 20 cm
in mammography with geometric magnification
18. Accelerating Potential (kVp)
The peak potential of the x-ray generator affects quality of the x-ray beam
and exposure to the patient.
Presently solid – state detectors, which employ non-invasive method for
peak tube potential measurement, are quite handy for this test.
20. Accuracy of Exposure Time
If the exposure time of the x-ray unit is not in order, the
radiograph can be under exposed or overexposed.
For this absolute timer method is adopted by measuring set and
measured time with digital timers.
Accuracy of exposure timer ± 10 %
21. Linearity of mA loading stations
• The tube current (mA) is equal to the number of electrons flowing from the
cathode to the anode per unit time.
• The exposure of the beam for a given kVp and filtration is proportional to the
tube current.
• This test is carried out to check the linearity of radiation output
with respect to change in tube current (mA) stations by keeping
timer station constant at a particular kV station.
22. Linearity of mA loading stations (contd..)
• Keeping exposure time and kVp constant, radiation output is measured at
different mA stations.
• Measurement for mA loading station is to be repeated for a number of times each
to eliminate statistical errors.
• Each mA loading station readings are averaged and the coefficient of linearity
(CoL) is evaluated from average (mR/mAs) or (mGy/mAs) as follows:
23. Tolerance: Coefficient of Linearity 0.1
Dose measuring instrument
Coefficient of linearity =
(X max -Xmin ) (Xmax + X min)
24. Linearity of timer loading stations
• The exposure time is the duration of X-ray production.
• Keeping the kVp and mA constant, radiation output is measured at different timer stations and
Coefficient of Linearity is evaluated.
• This test is carried out to check the linearity of radiation output with respect to change
in timer stations by keeping mA station constant at a particular kV station.
Tolerance: Coefficient of timer linearity < 0.1
25. • To check the constancy of radiation output.
• Arrange the X-ray source assembly, the diaphragm and the radiation detector for
measurement under narrow beam condition without the compression plate.
• Ensure that the radiation quality of the X-ray beam emerging from the X-ray source
assembly complies with applicable specified conditions for normal use.
RADIATION OUTPUT CONSISTENCY
IS13450(Part 2/Sec 45) :2007 Clause 29.1.105, page 21
• If no such conditions are specified, ensure
that the total filtration in the X-ray source
assembly is such as to comply with the
general standard as applicable
26. Out put Consistency
• Keeping fixed mA and time, radiation output is measured at various
available kVp stations. average(X) of mR/mAs (mGy/mAs) is
calculated.
• Consistency at each kVp station is checked by Evaluating the
coefficient of variation.
• Coefficient of variation =
Tolerance : The coefficient of variation of measured values of air kerma
shall not be greater than 0.05 for any combination of loading factors
1
X
-
Xi
1
2
n
X
27. Total Filtration of X-ray tube
• To cutoff low energy components from X-ray beam, which do not contribute
to diagnostic image formation but result in unnecessary patient exposure.
• If the filtration is too high, image contrast will be poor and unit will be
overloaded. Therefore it is necessary that the total filtration (inherent + added)
provided for the X-ray tube be as per the recommended value.
• The determination of half value thickness (HVT) of the X-ray beam is the
method of evaluation of total aluminum equivalent filtration of the X-ray tube.
28. Evaluation of HVL and Total Filtration
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5
Thickness of added Aluminium filters (mm)
Transmission
(%)
29. • Total aluminum equivalent filtration of the x-ray tube is evaluated by
determining the half value thickness of the beam.
• Transmission curve of the x-ray beam can be prepared by plotting a graph
between the absorber thickness and corresponding percentage transmission.
• The absorber thickness for 50 % transmission will be the half value
thickness of the x-ray beam.
• Total aluminum filtration could be determined from HVT using calibration
tables.
• Presently, new solid state detectors directly gives the values of HVT and
total filtration used in diagnostic X-ray equipment.
30. TOTAL FILTRATION AND ALUMINUM EQUIVALENCE OF THE
COMPRESSION DEVICE (contd..)
Operating
Potential
mAs Added filter (mm Al) Compression
Device
HVT mm
Al
30kVp 0.0 0.1 0.2 0.3 0.4 0.5
40kVp
IEC 601-1-3:1994 section 29.201.3, page 33age 29
31. TOTAL FILTRATION AND ALUMINIUM EQUIVALENCE OF THE
COMPRESSION DEVICE
Tolerance:
Total filtration in mammography equipment with Mo-Mo target filter combination
shall not be less than 0.03 mm of Mo. For any other combination the above values of
first HVL will apply.
The minimum total filtration equivalent to first HVL shall be provided as
First HVL at 30 kVp ≥ 0.3 mm Al
First HVL at 40 kVp ≥ 0.4 mm Al
First HVL at 50 kVp ≥ 0.5 mm Al
32. CALIBRATION OF COMPRESSION DEVICE
• Test Equipment
• A soft rubber block, 20 mm to 50 mm thick and 100 mm to 120 mm long wide
• Test Procedure:
• Position the X-ray tube-image receptor assembly to acquire a cranio-caudal projection of the breast.
• Place the force balance on the patient support and place the soft rubber block on the sensitive area of the
force balance.
• Operate the compression device, clamping the soft rubber block and record the reading.
• Measure the highest achievable forces for all compression modes.
• Repeat the procedure for at least three other orientations.
IS13450(Part 2/Sec 45) :2007 Clause 22.102.5, page 16
33. Cranio-caudal (CC)
Projection
The CC view is
particularly valuable in
detecting small valuable
cancer
IS13450(Part 2/Sec 45) :2007 Clause 22.102.5,
page 16
34. Tolerance :
• No compression device shall be able to apply a force exceeding 300 N.
• For power-driven compression, the compression device shall be able to
apply a force of at least 150 N and it shall be unable to apply a force
exceeding 200 N.
• For power-driven compression, the available operating force shall be
adjustable down to 70 N or less.
• If the value of applied force is displayed, the indication shall be accurate
to ±20 N.
IS13450(Part 2/Sec 45) :2007 Clause 22.102.5, page 16
CALIBRATION OF COMPRESSION DEVICE (Contd..)
35. IMAGING PERFORMANCE EVALUATION
Tolerance:
To pass the mammography image
quality standards at least
four fibers,
three calcification group and
three masses
must be clearly visible (With no
oblivious artifacts) at an average
glandular dose of less than 3 mGy
36. CONSTANCY OF THE AUTOMATIC EXPOSURE
CONTROL (AEC) ON FILM SCREEN RECEPTORS
• TEST METHOD
Measure the transmitted doses through the phantoms made of breast tissue
equivalent material, water or polymethyl methacrylate (PMMA), produced with
AEC in operation.
• Tolerance: AEC shall be designed such that the transmitted dose shall not vary by
more than 20% for all phantom thicknesses.
Breast imaging phantom
PMMA Breast Phantom
38. Radiation Leakage through Tube Housing
• The radiation leakage measurement is carried with an ionization
radiation survey meter. For checking the leakage radiation, the
collimator of the tube housing is fully closed and the tube is
energized at maximum rated tube potential and current at that
kVp.
• The exposure rate at one meter from the target is measured at
different locations (anode side, cathode side, front back and
top) from the tube housing and collimator.
39. • From the maximum leakage rate (mR/h) from both tube housing and collimator,
leakage radiation in one hour is computed on the basis of the workload of the
unit.
• Workload used for medical X-ray unit :
40 mA-min in 1 hour
• Max leakage from tube housing
= 40 mAmin X ----Max. leakage mR/hr
60 min X ----- mA used for measurement
40. Codal Requirements:
The leakage radiation averaged over an area of 10
cm2, with no linear dimension greater than 20 cm
and located at 5 cm from any point on the external
surface of X-ray tube housing does not exceed 0.02
mGy in one hour.
41. Survey of the X-Ray Installation
• Estimation of Dose Levels from measured dose rate values:
• If x (mR/hr) is the exposure level measured at a point with I (mA)
current and W (mA-min / wk) is the work load of the unit, then the
weekly exposure level at that point can be calculated as follows:
• Exposure level at the point = x mR / hr with I mA
42. • Weekly exposure = Y * W mR
• Weekly exposures due to all the three beam directions are added to get the
total weekly exposure at any location
• Permissible limit:
• For location of Radiation Worker:
• 20 mSv in a year (40 mR/week)
• For Location of Member of Public: 1 mSv in a year (2mR/week)
y
mA
mR
I
x
hr
mA
mR
I
x
min
60
*
43. CONCLUSION:
• With all this discussion we can conclude that QA is
• very important in diagnostic radiology facilities to confirm
the real diagnostic information with minimum dose to
patient.
45. Additional Information
Ready values to remember
Sr No Name of QA test Tolerance
1 kVp 1 kV
2 Accuracy of time 10%
3 mA /mAs / Timer linearity (coeff. of linearity) 0.1
4 Output consistency (Coeff. of variation) 0.05
5 Image Quality four fibers,
three calcification group and
three masses
6 Tolerance for filtration Total filtration for Mo-Mo filter 0.03 mm of
Mo
First HVL at 30 kVp ≥ 0.3 mm Al
First HVL at 40 kVp ≥ 0.4 mm Al
First HVL at 50 kVp ≥ 0.5 mm Al
7 Leakage from X-ray tube 0.02 mGy in 1 hour
46. Questions and Answers (Min 10)
• Q- What are the x-ray unit operating parameter on which output of x-ray unit depends?
Ans- kVp, mA and time
• Q -What is the tolerance of kV
A - 1 kV
• Q- What is the tolerance for leakage radiation
A – 0.02 mGy in one hour
• Q- What is the unit of work-load
A – mA-min per week
47. Questions and Answers
• Q- What is the role of filtration in x-ray unit?
A - To cutoff low energy components from X-ray beam, which do not contribute to
diagnostic image formation but result in unnecessary patient exposure.
• Q- What is the role of focal spot in image quality?
A- The ability for resolving the smallest size of the image (i.e detail) in a
radiograph depends on the focal spot size. The effective focal spot size is the length
and width of the focal spot as projected down the central ray in the X-ray field.
48. • Q. What is the criteria for passing image Quality standard
A. To pass the mammography image quality standards at least four fibers, three calcification group and three
masses must be clearly visible (With no oblivious artifacts) at an average glandular dose of less than 3 mGy.
• Q.Tolerance for total HVL in mammography x-ray tube?
A.- Total filtration in mammography equipment with Mo-Mo target filter combination shall not be less than 0.03
mm of Mo. For any other combination the above values of first HVL will apply. The minimum total filtration
equivalent to first HVL shall be provided as
First HVL at 30 kVp ≥ 0.3 mm Al
First HVL at 40 kVp ≥ 0.4 mm Al
First HVL at 50 kVp ≥ 0.5 mm Al
49. References and sources for additional information:
• IS 13450 (Part 2/Sec 45) : 2007 / IEC 60601-2-45: 2001 ‘Medical electrical equipment Part 2/45: Particular
requirements for the safety of mammographic X-ray equipment and mammographic stereotactic devices’
IEC 60601-2-28 : 1993 Medical electrical equipment - Part 2-28: Particular requirements for the safety of X-ray source
assemblies and X-ray tube assemblies for medical diagnosis
• IEC 61223-3-2: 1996 Evaluation and routine testing in medical imaging departments - Part 3-2: Acceptance tests -
Imaging performance of mammographic X-ray equipment
• IEC 60601-1-3 (1994) General requirements for the safety; Section 3 Collateral Standard: General requirements for
radiation protection in diagnostic X-ray equipment
• IEC 60788:1984, Medical radiology - Terminology
• AERB Safety Code for Medical Diagnostic X-ray Equipment and Installations, AERB/SC/MED-2 (Rev.1)
• For additional information please refer to AERB website: www.aerb.gov.in
• http://www.aerb.gov.in/AERBPortal/pages/English/t/XRay/forms/QAMammography.doc
50. List of presentations in the training Module
Basics of Diagnostic X-ray Equipment
Biological effects of Radiations
Medical X-ray imaging techniques
Planning of Diagnostic X-ray facilities
Quality Assurance of X-ray equipment
Quality Assurance of Computed Tomography equipment
Radiation Protection in Diagnostic Radiology Practice
Causes, prevention and investigation of excessive exposures in
diagnostic radiology
Regulatory Requirements for Diagnostic Radiology Practice