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FIG. 33. Image of MTF test tool mounted on a QC test object.8.6.1.4. Interpretation of results and conclusionsTolerances:(1) The spatial frequencies at which the MTF has fallen to 50 and 20% should not be less than the valuesspecified in Table 17 for the relevant model of digital mammography equipment.(2) The MTF at 2.5, 5 and 7.5 cycles/mm should not change more than 10% from the value established atcommissioning of the equipment.(3) If it is suspected that the spatial resolution may vary excessively from place to place in the image (e.g. due todetector deterioration), the MTF should be measured at different locations in the image and thesemeasurements compared.(4) A variation in noise from place to place in the image (see Section 8.5.5) can be an indicator of changes in localMTF [58].106
TABLE 17. ACCEPTABLE FREQUENCIES AT WHICH THE MTF FALLS TO 50% AND 20% (CYCLES/mm)(value perpendicular to chest wall/value parallel to chest wall)SystemContact mode50% 20%Agfa CR (MM3.0) 2.0/2.0 4.5/3.5Agfa CR (HM5.0) 2.5/2.0 5.5/4.5Carestream CR (EHR-M3) 2.0/2.0 4.5/4.0Carestream CR (EHR-M2) 1.5/1.5 3.5/3.0Konica CR (RP-6M) 2.5/2.0 5.0/3.5(RP-7M) 3.0/2.0 6.0/4.0(CP-1M) 3.5/2.0 7.5/4.0Fuji Amulet 4.5/4.5 7.5/4.5Fuji Profect (HR-BD) 3.0/2.0 6.0/4.0GE 2000D 2.5/2.5 5.0/5.0GE DS 3.5/3.5 6.0/6.0GE Essential 2.5/2.5 4.5/4.5Hologic Selenia 6.5/6.5 9/9IMS Giotto 4.0/4.0 6.5/6.5Philips PCREleva 5.0/5.0 9.0/8.0Planmed Nuance 4.5/5.5 9.0/8.0Sectra L30 4.0/5.5 6.0/8.0Siemens Inspiration 5.0/5.0 8.0/8.0Siemens Novation 5.0/5.0 9.0/8.08.6.1.5. Recommendations and corrective actionsIf the 50 or 20% frequencies for the MTF, either parallel or perpendicular to the chest wall, drop below thevalues given in Table 17, or if the MTF at 2.5, 5 and 7.5 cycles/mm has changed by 10% or more from previouslymeasured values, consult the manufacturer’s service representative.8.6.1.6. Time frame for corrective actionImmediately: Corrective action should be taken before any further patients are imaged.107
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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
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To allow full utilization of the di
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5.7. ARTEFACTSWhile the incidence o
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FIG. 10. Detector crystallization.
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FIG. 13. A more subtle example of a
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FIG. 16. An example of poor collima
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7. RADIOGRAPHER’S QUALITY CONTROL
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7.1. DAILY TESTS7.1.1. Monitor insp
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7.1.3. Daily flat field phantom ima
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7.1.4. Visual inspection for artefa
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7.1.5. Laser printer sensitometry7.
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7.1.6. Image plate erasure (CR syst
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FIG. 19. Modified TG18-QC pattern w
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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 and 90: 7.5. SEMI-ANNUAL TESTS7.5.1. Comput
Page 91 and 92: 8. MEDICAL PHYSICIST’S QUALITY CO
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: 8.6. EVALUATION OF SYSTEM RESOLUTIO
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
Page 141 and 142: FIG. 38. Measurement of illuminatio
Page 143 and 144: 8.11. LASER PRINTER8.11.1. Laser pr
Page 145 and 146: 8.11.1.5. Recommendations and corre
Page 147: 8.12.1.4. Interpretation of results
Page 150 and 151: iopsies are performed, a sink is of
Page 152 and 153: Appendix IISPECIFICATIONS OF TEST E
Page 154 and 155: TABLE 24. SPECIFICATIONS OF TEST EQ
Page 156 and 157: FIG. 40. Image acquired with a unif
Page 158 and 159: FIG. 43. The left hand image is par
Page 160 and 161: FIG. 45. A TG18-QC test pattern dis
Page 162 and 163: [29] ALSAGER, A., YOUNG, K.C., ODUK
Page 165 and 166: Annex IRADIOGRAPHER DATA COLLECTION
Page 167 and 168: 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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