iaea human health series publications - SEDIM

More documents

Recommendations

Info

8.2. MAMMOGRAPHY UNIT ASSEMBLY8.2.1. Mammography unit assembly evaluation8.2.1.1. ScopeThe mammography system contains many mechanical components. These are subject to wear or degradationover time, resulting in possible safety or performance problems. Therefore, they must be checked on a regular basis.It is also essential that the examination parameters be recorded correctly in the digital image file. For digitalmammography, an appropriately populated DICOM header complies with this labelling requirement.— Objective: To ensure that all locks, detents, angulation indicators and mechanical support devices for theX ray tube and breast support assembly are operating properly, and that the DICOM image file headers arecorrectly populated.— Frequency: Semi-annually is desirable; annually is essential.8.2.1.2. InstrumentationThermometer, preferably mounted on the wall of the digital mammography room.8.2.1.3. Methodology(1) Measure the temperature in the mammography acquisition room.(2) Verify that the freestanding dedicated mammography unit is mechanically stable under normal operatingconditions.(3) Visually inspect the unit for loose parts, cracks in the compression paddles, Bucky cleanliness and overallintegrity.(4) Check that all hoses and cables are free of breaks, crimps and knots. Hoses and cables should not be locatedunder heavy equipment.(5) Verify that all moving parts move smoothly, without undue friction; that cushions or bumpers appropriatelylimit the range of available motion; and that no obstructions hinder the full range of motion within theselimits.(6) Set and test each lock and detent independently to ensure that mechanical motion is prevented when the lockor detent is set.(7) Verify that angulation indicators function correctly.(8) Verify that the image receptor assembly is free of wobble and vibration during normal operation.(9) Verify that the CR cassette slides smoothly into the holder assembly and is held securely in any orientation(for CR operation only).(10) Verify that it is possible to override the auto-decompression function so that compression can be maintained(for procedures such as needle localizations) and that its status is displayed continuously (if autodecompressionis available).(11) Verify that compression can be manually released in the event of a power failure or automatic release failure.This verification can be done by reference to type testing data for the same model. (In the type testing, thepower supply to the equipment would be turned off with a phantom under compression and the manualcompression control would then be used to release the compression.)(12) Verify that in normal operation, the patient and operator are not exposed to sharp or rough edges or otherhazards, including electrical hazards.(13) Verify that all panel switches, indicator lights and meters are working properly.(14) Verify that the operator is protected by adequate radiation shielding during exposure.(15) Verify that current and accurate exposure technique charts are posted and confirmed by consulting with theradiographer.82
(16) On any randomly selected patient image, verify that displayed and/or printed images contain the correctinstitution name and address, unit number (if there is more than one on the site), patient name, patient IDnumber, radiographer’s initials, projection, laterality, and technique factors, and that the time of imageacquisition and the date are correct (note that after software upgrades, the stored time zone or other data mayhave inadvertently been changed and be incorrect). This can be accomplished by looking at the informationincluded with the image on the review workstation, by inspecting printed films, if available, or by looking atthe contents of the DICOM header of an image with appropriate analysis software. Record that the values ofdisplayed information are complete or note necessary changes on the unit assembly evaluation chart (Chart 1in Annex II).(17) Record a ‘pass’ or ‘fail’ of each inspection item on the data collection chart.8.2.1.4. Recommendations and corrective action(1) Room temperature should be in the range recommended by the manufacturer. If the radiographer indicatesthat the temperature sometimes falls outside this range, a monitoring programme should be established toprevent premature failure of the equipment.(2) The digital mammography unit must be safely installed and must present no undue hazards.(3) Items that are hazardous or inoperative, or that operate improperly should be repaired by appropriate servicepersonnel.8.2.1.5. Time frame for corrective action(1) If the room temperature is not in the range recommended by the manufacturer, the heating/ventilating/airconditioning service personnel should be called immediately.(2) For all items in Section 8.2.1.3 except items 5 and 7, corrective action must be taken immediately, before anyfurther patients are imaged. For items 5 and 7, corrective action must be taken within 30 days of the test date.83
Page 1 and 2:
X raysdel matrixCs scintillatorLine
Page 3 and 4:
QUALITY ASSURANCE PROGRAMMEFOR DIGI
Page 5 and 6:
IAEA HUMAN HEALTH SERIES No. 17QUAL
Page 7 and 8:
FOREWORDThe application of radiatio
Page 14:
An effective QA programme is necess
Page 17 and 18:
The Integrating the Healthcare Ente
Page 21 and 22:
technology. Systems containing othe
Page 23 and 24:
X raysTop electrodea-Se layerCharge
Page 25 and 26:
dose received by inhomogeneous real
Page 27 and 28:
2.3.8.1. Soft copy displayFlat pane
Page 29 and 30:
3. ELEMENTS OF HIGH QUALITY MAMMOGR
Page 31:
— The ability to mask edges of ma
Page 34 and 35:
Disposal orsaleNew facility(start h
Page 36 and 37:
4.2.3. Radiographer (mammography te
Page 38 and 39:
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 and 90: 7.5. SEMI-ANNUAL TESTS7.5.1. Comput
Page 91 and 92: 8. MEDICAL PHYSICIST’S QUALITY CO
Page 93: 8.1. NOTE ON IMAGE NAMING CONVENTIO
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
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
Page 169 and 170:
Chart 4 LASER PRINTER SENSITOMETRY
Page 171 and 172:
Chart 6 — WEEKLY DISPLAY MONITOR
Page 173 and 174:
Chart 7(b) WEEKLY QC TEST OBJECT:
Page 175 and 176:
Chart 9 — SAFETY AND FUNCTION CHE
Page 177 and 178:
Chart 11 — LASER PRINTER ARTEFACT
Page 179 and 180:
Chart 13(a) — RECORD OF DIGITAL M
Page 181 and 182:
Chart 14 — CR PLATE SENSITIVITY M
Page 183 and 184:
Annex IIITHE MAMMOGRAPHY EXTRACTThe
Page 185 and 186:
GLOSSARYair kerma. The energy depos
Page 187 and 188:
image quality. The overall merit of
Page 189:
CONTRIBUTORS TO DRAFTING AND REVIEW
show all

iaea human health series publications - SEDIM

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?