基于定位像的自動(dòng)管電壓選擇技術(shù)與常規(guī)固定管電壓技術(shù)在胰腺實(shí)性病變成像中的比較
[Abstract]:Objective to compare the image quality and radiation dose of automatic tube voltage selection technique and fixed tube voltage technique based on localization image in the imaging of pancreatic solid lesions. Methods from January 2014 to August 2016, the clinical data of 113 patients with pancreatic solid lesions confirmed by postoperative pathology and double-source CT examination before operation were analyzed retrospectively. Fixed tube voltage (120 kV) and tube current adjustable scanning were performed in 53 patients (group 1), tube voltage (tube voltage step: 90100 kV) and automatic tube current scanning (group 2). The abdominal circumference of the patients was measured by two experienced radiologists. The subjective image quality scores and objective image quality parameters of arterial and portal phase images were evaluated and the scanning dose parameters were recorded. Results in group 2, 45 patients underwent 90 kV scan and 15 patients underwent 100 kV scan, and the mean abdominal circumference of 90 kV patients was (287 鹵24) mm, lower than that of 100 kV group (328 鹵22) mm (t 0.731g P 0.0008). The mean CT volume dose index of group 2 was (3.9 鹵1.0) m Gy,) lower than that of group 1 (9.0 鹵1.9) m Gy) by 56.7%. The average dose length product (109 鹵38) m Gy cm,) was 60.5% lower than that in group 1 (276 鹵83) m Gy cm). The background noise standard deviation of arterial phase and portal phase in group 2 was significantly higher than that in group 1 (6.4 鹵0. 9) and (6.4 鹵1. 0) HU, (t = 6. 6 鹵1. 4) (t = 3. 757). P0. 0003) and (5. 5 鹵1. 4) HU (T- 3. 828) and (5. 5 鹵1. 4) HU (T- 3. 828, P0. 0006). The signal-to-noise ratio of the main portal vein was 18.8 鹵9.3 鹵19.3 and 17.4 鹵6.7 鹵33.1 鹵7.2 in group 2, which was significantly higher than that in group 1 (13.1 鹵8.7). P0. 001), 56.5 鹵22. 6 (Tu-2. 268 P0. 025), 14. 1 鹵8. 1 (t-2. 283 P0. 024), 28. 9 鹵8. 8 (t-2. 613, P0. 009). Conclusion the third generation CT automatic tube voltage selection technique based on localization image can reduce the radiation dose of pancreatic solid lesions, and the image quality is approximately the same as that of the second generation dual source CT fixed tube voltage technique.
【作者單位】: 中國(guó)醫(yī)學(xué)科學(xué)院北京協(xié)和醫(yī)學(xué)院北京協(xié)和醫(yī)院放射科;
【基金】:國(guó)家自然科學(xué)基金(81371608) 衛(wèi)生公益性行業(yè)科研專項(xiàng)項(xiàng)目(201402001、201402019)~~
【分類號(hào)】:R576;R816.5
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