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TABLE 9. TOLERANCES FOR EXPOSURE INDEX FOR CR PLATES aBasic toleranceTolerance in terms of CR exposure indexFuji, Konica, Philips Carestream AgfaVariation among plates ofthe same sizeS# for individual plates within±5% of mean for same sizeEI for individual plates within±20 units of mean for same sizeSAL/SALlog/PVIlog forindividual plates within±2.5%/±200/±290 of meanfor same sizeVariation between plate sizesS# difference for twodifferent plate sizes
8. MEDICAL PHYSICIST’S QUALITY CONTROL TESTSTable 10 lists the QC tests to be performed by the medical physicist. In addition to the frequencies outlined inthe table, all tests should be performed at commissioning (i.e. before the equipment is initially used to imagepatients). The tests do not necessarily have to be performed in the order in which they appear in this publication.The preferred order will depend on various factors relating to the mammography facility as well as the medicalphysicist’s preferences, always bearing in mind that there exist tests whose results affect the execution of othertests. In some cases, the medical physicist may also be responsible for performing some of the tests described in thesection on radiographer’s tests (Section 7). Data collection sheets can be found in Annex II and are also available inelectronic format, along with other information relevant to physics testing of digital mammography, on the IAEAweb site at: http://humanhealth.iaea.orgFor many of the tests, it is useful to carry out the analysis of images on a separate computer. For this purpose,it is desirable that test images be exported from the digital mammography system in the DICOM ‘for processing’format. In addition, to facilitate testing of the soft copy and hard copy displays, it is desirable to be able to importtest images to the digital mammography system in a convenient manner.TABLE 10. MEDICAL PHYSICIST’S QUALITY CONTROL TESTSTest Priority a Suggested frequency TolerancesMammography unit assemblyMammography unit assemblyevaluationEAnnually (E)Semi-annually (D)See Section 8.2.1.4CompressionCompression force and thicknessaccuracyEAnnually (E)Semi-annually (D)Powered: 150 to ≤200 N;Manual: ≤300 NSee also Section 8.3.1.4AEC evaluationSite technique factors for SDNR(radiographer baseline)EAt commissioning and afterchanges to AEC softwareNot applicableAEC evaluation E Annually or after changesto AEC softwareSee Section 8.4.2.4Detector performanceBaseline detector performance E At commissioning and afterdetector changeNot applicableDetector response and noise E Annually and after detector service See Section 8.5.2.4Spatial linearity and geometricdistortion of the detectorE Annually and after detector change See Section 8.5.3.4Detector ghosting E Annually and after detector change Ghost image SDNR ≤2.0Detector uniformity andartefact evaluationE Annually and after detector change, etc. See Section 8.5.5.479
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X raysdel matrixCs scintillatorLine
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QUALITY ASSURANCE PROGRAMMEFOR DIGI
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IAEA HUMAN HEALTH SERIES No. 17QUAL
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FOREWORDThe application of radiatio
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An effective QA programme is necess
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The Integrating the Healthcare Ente
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technology. Systems containing othe
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X raysTop electrodea-Se layerCharge
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dose received by inhomogeneous real
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2.3.8.1. Soft copy displayFlat pane
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3. ELEMENTS OF HIGH QUALITY MAMMOGR
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— The ability to mask edges of ma
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Disposal orsaleNew facility(start h
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4.2.3. Radiographer (mammography te
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5.2.2. Electronic versus geometric
Page 40 and 41: To allow full utilization of the di
Page 42 and 43: 5.7. ARTEFACTSWhile the incidence o
Page 44 and 45: FIG. 10. Detector crystallization.
Page 46 and 47: FIG. 13. A more subtle example of a
Page 48 and 49: FIG. 16. An example of poor collima
Page 51 and 52: 7. RADIOGRAPHER’S QUALITY CONTROL
Page 53 and 54: 7.1. DAILY TESTS7.1.1. Monitor insp
Page 55 and 56: 7.1.3. Daily flat field phantom ima
Page 57 and 58: 7.1.4. Visual inspection for artefa
Page 59 and 60: 7.1.5. Laser printer sensitometry7.
Page 61 and 62: 7.1.6. Image plate erasure (CR syst
Page 63 and 64: FIG. 19. Modified TG18-QC pattern w
Page 65 and 66: FIG. 21. Radiologist workstation wi
Page 67 and 68: 7.2.1.6. Time frame for corrective
Page 69 and 70: 7.2.3. Weekly quality control test
Page 71 and 72: Note: It is not necessary to view t
Page 73 and 74: TABLE 7. TOLERANCES FOR IMAGING WEE
Page 75 and 76: 7.2.4.4. Interpretation of results
Page 77 and 78: 7.3.1.5. Recommendations and correc
Page 79 and 80: artefacts are typically best seen w
Page 81 and 82: 7.3.3.5. Recommendations and correc
Page 83 and 84: 7.4.1.3. Methodology(1) Annotate th
Page 85 and 86: RECORD OF DIGITAL MAMMOGRAPHY REPEA
Page 87 and 88: (3) Including examinations of at le
Page 89: 7.5. SEMI-ANNUAL TESTS7.5.1. Comput
Page 93 and 94: 8.1. NOTE ON IMAGE NAMING CONVENTIO
Page 95 and 96: (16) On any randomly selected patie
Page 97 and 98: FIG. 30. Positioning of bathroom sc
Page 99 and 100: (6) The target, filter, kV, grid, d
Page 101 and 102: (2) Stack the 20 and 25 mm PMMA sla
Page 103 and 104: TABLE 13. ACCEPTABLE AND ACHIEVABLE
Page 105 and 106: 8.5. DETECTOR PERFORMANCE8.5.1. Bas
Page 107 and 108: 8.5.2. Detector response and noise8
Page 109 and 110: the service engineer responsible fo
Page 111 and 112: (13) Using the annotation tool on t
Page 113 and 114: Breast supportPMMA slabBreast suppo
Page 115 and 116: (10) Place the thinner test object
Page 117 and 118: 8.6. EVALUATION OF SYSTEM RESOLUTIO
Page 119 and 120: TABLE 17. ACCEPTABLE FREQUENCIES AT
Page 121 and 122: 8.7. X RAY EQUIPMENT CHARACTERISTIC
Page 123 and 124: 8.7.2. Incident air kerma at the en
Page 125 and 126: 8.8. DOSIMETRY8.8.1. Mean glandular
Page 127 and 128: TABLE 21. ACCEPTABLE AND ACHIEVABLE
Page 129 and 130: FIG. 34. Suggested layout for ruler
Page 131 and 132: 8.10. IMAGE DISPLAY QUALITYThe accu
Page 133 and 134: FIG. 35. Modified TG18-QC test patt
Page 135 and 136: 8.10.1.5. Interpretation of results
Page 137 and 138: 8.10.2. Monitor luminance response
Page 139 and 140: TABLE 22. MONITOR PERFORMANCE TOLER
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FIG. 38. Measurement of illuminatio
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8.11. LASER PRINTER8.11.1. Laser pr
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8.11.1.5. Recommendations and corre
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8.12.1.4. Interpretation of results
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iopsies are performed, a sink is of
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Appendix IISPECIFICATIONS OF TEST E
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TABLE 24. SPECIFICATIONS OF TEST EQ
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FIG. 40. Image acquired with a unif
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FIG. 43. The left hand image is par
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FIG. 45. A TG18-QC test pattern dis
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[29] ALSAGER, A., YOUNG, K.C., ODUK
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Annex IRADIOGRAPHER DATA COLLECTION
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Chart 2 — DIGITAL MAMMOGRAPHY (DM
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Chart 4 LASER PRINTER SENSITOMETRY
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Chart 6 — WEEKLY DISPLAY MONITOR
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Chart 7(b) WEEKLY QC TEST OBJECT:
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Chart 9 — SAFETY AND FUNCTION CHE
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Chart 11 — LASER PRINTER ARTEFACT
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Chart 13(a) — RECORD OF DIGITAL M
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Chart 14 — CR PLATE SENSITIVITY M
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Annex IIITHE MAMMOGRAPHY EXTRACTThe
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GLOSSARYair kerma. The energy depos
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image quality. The overall merit of
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CONTRIBUTORS TO DRAFTING AND REVIEW
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