| Guo Senlin,Ren Yue,Zhang Yongxian,Zhang Zongrui,Yu Binbin,Liu Dandan,Niu Yantao.The experimental study of the effect of detector combination on image resolution in wide-detector CT[J].Chinese Journal of Radiological Medicine and Protection,2022,42(5):396-399 |
| The experimental study of the effect of detector combination on image resolution in wide-detector CT |
| Received:February 17, 2022 |
| DOI：10.3760/cma.j.cn112271-20220217-00058 |
| KeyWords:Wide-detector CT Contrast resolution Scanning mode |
| FundProject: |
| Author Name | Affiliation | E-mail | | Guo Senlin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Ren Yue | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Zhang Yongxian | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Zhang Zongrui | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Yu Binbin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Liu Dandan | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Niu Yantao | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | ytniu163@163.com |
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| Abstract:: |
| Objective To investigate the effect of different scanning modes,detector width and location in detector on high and low contrast resolution of wide-detector CT image.Methods The Catphan600 phantom with high and low contrast resolution modules was scanned with GE Revolution CT at the same CTDIvol. The scans were performed with the detector widths of 40,80 and 160mm for sequential scanning mode and with the detector width/pitch combinations of 40 mm/0.516,40 mm/0.984,80 mm/0.508 and 80 mm/0.992 for spiral scanning mode. The resolution modules were placed at the adjacent region between two sequential scans,central and foot side edge in the longitudinal scanning range seperately. The subjective evaluation of the high and low contrast resolution was performed by two radiologists.Results The high contrast resolution was 8 LP/cm at adjacent region between two sequential scans with the detector width of 80mm or 160mm in sequential scanning mode, and at the pitch of 0.5 in spiral scanning mode, while it was 7 LP/cm for the rest of detector combinations. The distinguishable diameter was 3mm at 1% low contrast resolution at foot side edge with the detector widths of 80mm or 160mm in the sequential scanning mode, and it was 2mm for all the other conditions. The distinguishable diameter was 2mm at 1% low contrast resolution with the detector width of 40mm and pitch 0.516 in the spiral scanning mode and it was worse with the wider detector and larger pitch.Conclusions For the wide-detector CT, scanning mode,detector width,location in detector and pitches will affect the high and low contrast resolution to some degree. Appropriate selection should be done according to actual needs in clinical practice. |
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