Selection and Quality Assurance of Monitors for Mammogram Diagnosis

Transcription

1 B 5F Selection and Quality Assurance of Monitors for Mammogram Diagnosis Noriyuki HASHIMOTO and Kiyotaka HIRA R&D, Visual Products, EIZO NANAO CORPORATION 153 Shimokashiwano, Hakusan, Ishikawa , Japan Sales & Marketing, EIZO NANAO CORPORATION Sinagawa Inter City Tower-B, 5F, Konan, Minato, Tokyo , Japan Received February 20, 2006 Abstract : Digital mammography has spread among radiologists recently. As a result, imaging tool for mammogram diagnosis is changing from hardcopy to softcopy. It means that LCD monitor is getting more popular as an medical imaging device for diagnosis, instead of film screen. However, LCD monitor has different characteristics from film screen and we need to understand them for reliable diagnosis.in this paper, resolution, luminance response and human visual systems are described firstly. And JESRA is explained as a quality control guideline for medical LCD monitors. The performance of LCD monitor will keep improving, and there will be further studies related to ideal image display. Key words : Liquid Crystal Display LCD, Monitor, Quality control, Mammography CRT Cathode Ray Tube LCD Liquid Crystal Display [1, 2] CRT LCD 2 LCD LCD LCD CRT LCD LCD R,G,B LCD 3M 5M LCD Table 1 LCD lp 1M M M M Fig.1 LCD a 3M b 5M 64

2 Table 2 fit lp Table fit 1M M M M Fig.3 5M LCD MTF LCD M M 2M fit 5 M 2 M LCD MTF Modulation Transfer Function CRT CRT LCD LCD WS Wiener Spectrum AG Anti-Glare AG 5MLCD AG MTF AG MTF 100 cd/ lp/= cycles/ [3] GSDF Grayscale Standard Display Function [4] lp/ 0.2 Fig.2 AG Fig.4 600,100cd/ [3] Vol.23 No

3 3MLCD 600 3MLCD [5] GSDF 1JND Just-Noticeable Difference 0.05 cd/ 1023 JND GSDF IHE Integrating Healthcare Enterprise CPI Consistent Presentation of Images LCD cd/ 800 cd/ 1 LCD 600 : cd/ GSDF cd/ cd/ GSDF cd/ Fig cd/gsdf Fig cd/ ) PACS PACS GSDF 8bit 10 bit 14 bit 8 bit 10 bit 8 bit [6] Fig.5 Fig.7 a 20cd/, b 100cd/, c 400cd/ 66

4 GSDF [3] GSDF 100 cd/ GSDF GSDF 5M LCD FDA FDA 510 k for Mammography AAPM TG-18 [7] QS-RL [8] Fig.8 A 100 cd/ B [3] CRT LCD LCD 10 LCD CRT LCD 50 LCD 3 5 CRT CRT a 100% b 50% Fig.9 Vol.23 No Fig.10

5 8 JESRA X-0093 [9] IEC JESRA X IEC : 1994 [10] IEC JIS Z [11] 2 IEC [12] AAPM TG18 3 JESRA X-0093 : 2005JIRA JIRA AAPM TG18, Assessment of Display Performance for Medical Imaging SystemsAAPM American Association of Physicists in Medicine TG-18 Primary Secondary 5 Qualitätssicherungs-Richtlinie QS-RL : 2003 DIN V Application Category AApplication Category B 6 DIN V : 2001 [13] IEC Addendum European Guidelines 3rd ed., Digital Mammography [14]EUREF European Reference Organization for Quality Assured Breast Screening and Diagnostic Services 2003 European Guidelines for Quality Assurance in Mammography Screening AAPM TG-18 4th ed 8 MQSA Mammography Quality Standards Act 1992 NEMA, ACR JESRA X-0093 Fig GSDF 4 68

6 1 JRS v1.1 [15] X ACR 156 [ 1 ] 2 -CRT 58 11, , [ 2 ] 3 -LCD 59 1, 21-28, [ 3 ] Michael J.Flynn :Visual Requirements for High-Fidelity Display, Advances in Digital Radiography, RSNA Categorical Course in Diagnostic Radiology Physics, , [ 4 ] DICOM PS3.14, Digital Imaging and Communications in Medicine DICOMPart 14: Grayscale Standard Display Function. [ 5 ] Ehsan Samei : Degital Mammographic Displays, Advances in Breast Imaging-Physics, RSNA Categorical Course in Diagnostic Radiology Physics, , [ 6 ] M.J.Flynn, J.Kanicki, A.Badano et al.:high Fidelity Electronic Displays of Digital Radiographs,Imaging and Therapeutic Technology, Radiographics, 19 6, , [ 7 ] Samei E, Badano A, Chakraborty D et al. : Assessment of Display Performance for Medical Imaging Systems, Report of the American Association of Physicists in Medicine AAPM Task Group 18, AAPM On-Line Report No.03, [ 8 ] Qualitätssicherungs-Richtlinie QS-RL : 2003, zur Durchführung der Qualitätssicherung bei Röntgeneinrichtungen zur Untersuchung oder Behandlung von Menschen nach den16 und 17 der Röntgenverordnung-Qualitätssicherungs-Richtlinie QS-RL - [ 9 ] JESRA X-0093 : 2005 JIRA, [10] IEC :1994,Evaluation and routine testing in medical imaging departments-part 2-5: Constancy tests-image display devices. [11] JIS Z : [12] IEC Ed. 1.0,Evaluation and routine testing in medical imaging departments Part 3-6 Acceptance Tests- Image Display Devices [13] DIN V : 2001, Image quality assurance in x-ray diagnostic X-ray departments PART 57, Acceptance testing for image display devices. [14] Addendum European Guidelines 3rd ed.,digital Mammography, European Reference Organization for Quality Assured Breast Screening and Diagnostic Services EUREF, [15] v1.1 JRS, Vol.23 No