06_学術_関節単純X線画像における_1c_梅木様.indd

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1 Arts and Sciences X The formulation of femoral heard measurement corrected enlargement ratio using hip joints X-ray Imaging Key words: Bipolar Hip Arthroplasty (BHA) Preoperative planning Enlargement ratio Summary The measurement of femoral head size was performed using X-ray or computed tomography (CT) examinations as preoperative assessment of bipolar hip arthroplasty (BHA). However, these conventional methods have some problems such as exposure dose of CT and the measurement error of X-ray examinations. We formulated new method to improve measurement of femoral head diameter for hip joint frontal view by calculation of enlarged ratio from hip joint axis view formulated method. The objective of this study was to demonstrate measurement accuracy between conventional and formulated methods. The artificial femoral head as phantom was used for physical evaluation, which was compared between conventional and formulated methods about differences of source image receptor distance (SID), target image receptor distance (TID) and inner rotation. In addition, the clinical 16 cases underwent femoral head replacement were retrospectively used in this study. The difference of SID and inner rotation have no significantly difference between conventional and formulated methods, however formulated method indicated significant lower than conventional method about difference of TID and clinical study. Furthermore, femoral head measurement of TID and clinical using formulated method have almost errors within 1mm. The formulated method was demonstrated high measurement accuracy by comparison with conventional method. 06 X CT X CT SID TID 16 SID TID TID 1mm Takuya Umeki 1 Takayuki Shibutani 2 Shinsuke Konishi 1 Yusuke Yamaguchi 1 1 Department of Radiological Technology, Fuchu Hospital 2 Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University X 2, 3 4 three dimensional computed tomography 3DCT 5 X 110% 2 3 source image receptor distance SID 100cm IP target IP distance TID

GRID 8 1 40 line/cm LCD- AD199GEB Digital Imaging and Communications in Medicine DICOM 45 1.3. SID 100cm 0 25 SID 100cm 90 X X 45 Fig.

2 3DCT 5 6 quality of life QOL 1mm 1mm X 2 7 X X 3DCT XMRAD-A50S RADREX Computed Radiology CR FCR Speedia CS CR Console Advance Imaging Plate IP ST-VI X MS-Xray GRID line/cm LCD- AD199GEB Digital Imaging and Communications in Medicine DICOM SID 100cm 0 25 SID 100cm 90 X X 45 Fig TID C C Fig.2 Eq source image receptor distance SID 100cm SID 100cm 90 X X Fig.1 Geometry of hip joints frontal and axis views about general radiography. (a): frontal view, (b): axial view vol.64 no.782

X Arts and Sciences X-ray tube SID: 80~120 cm Artificial femoral head TID: 10 cm Cassette Fig.3 Geometry of hip joint frontal view by the difference of source image receptor distance (SID).

3 X Arts and Sciences X-ray tube SID: 80~120 cm Artificial femoral head TID: 10 cm Cassette Fig.3 Geometry of hip joint frontal view by the difference of source image receptor distance (SID). X-ray tube 06 SID: 100 cm Fig.2 Measurement method to frontal and axial views Artificial femoral head Cassette TID: 2.15~15 cm Y=A b-c /b Eq.1 Y mm Amm b SID mm C TID mm mmSID 100cm 10cm kV 200mA0.36sec Fig.4 Geometry of hip joint frontal view by the difference of target-imaging plate distance (TID) SID 10cm SID cm Fig.3TID SID TID TID SID 100cm TID cm Fig.4TID

4 Angle: -20~20 X-ray tube Artificial femoral head SID: 100 cm 1.6. Paired t5% 2. Fig.5 Geometry of hip joint frontal view by the difference of rotation angles for artificial femoral head. TID TID TID SID 100cm TID 10cm Fig.5 TID TID Cassette TID: 10 cm SIDFig.6 SID 0.43mm 0.33mm SID 80cm 1mm 1mm TIDFig.7 TID 1.93mm 0.22mm TID 8cm 10cm 1mm 1mm Fig mm 0.18mm 1mm Fig mm 0.58mm 1mm TID 2 4 Fig.6 Comparison between conventional and formulated methods of the artificial femoral head measurement by the different of source image receptor distance (SID) vol.64 no.782

X Arts and Sciences 1 3 Fig.7 Comparison between conventional and formulated methods of the artificial femoral head measurement by the different of target-imaging plate distance (TID) Fig.

5 X Arts and Sciences 1 3 Fig.7 Comparison between conventional and formulated methods of the artificial femoral head measurement by the different of target-imaging plate distance (TID) Fig.8 Comparison between conventional and formulated methods of the artificial femoral head measurement by the different of internal rotation angles Fig.9 Comparison between conventional and formulated methods of femoral head measurement by clinical study X CT QOL 1mm 1mm SID TID SID SID 80cm1mm 2 SID 100cm SID SID 100cm SID 1mm SID 100cm TID TID TID 0.5mm 1mm

6 51 1mm 3mm 4 TID X 1mm 1mm 1 / Nobuhiko Samoto, MD, et al.: Acetabular Diameter Measurement Determines Proper Prosthetic Head Size in Hemiarthroplasty for Femoral Head Osteonecrosis. The Journal of Arthroplasty D Hip Joint vol.64 no.782

Accuracy check of grading of XCT Report Accuracy check of grading and calibration of CT value on the micro-focus XCT system Tetsuro Hirono Masahiro Ni

JAMSTEC Rep. Res. Dev., Volume 8, November 2008, 29 36 X CTm/pixel X CT X CT. -. mol/l KI KI CT CT X CT CT ; - - +- -- [email protected] Accuracy check of grading of XCT Report Accuracy check