| 摘要: |
| 目的探讨自然呼吸状态下高螺距双源CT肺血管造影（CTPA）技术对可疑肺栓塞患者应用的可行性、影像质量。方
法对54例临床疑似肺动脉栓塞的患者（高螺距组），采用第二代双源CT 行CT肺血管造影（CTPA），患者在自然呼吸下行高螺距CTPA 检查（螺距为3.0，120kV，100mAs，50ml 对比剂）；另选前期检查患者54 例作为常规组行常规CTPA 检查（螺距为0.8，120kV，100mAs，80ml对比剂），深吸气后屏气扫描。记录PA 强化程度、图像噪声、信噪比、图像的整体质量、扫描范围内肺动脉分支是否存在对比剂充盈不均和心脏、呼吸运动伪影以及辐射剂量，结果进行统计学分析。结果高螺距组肺动脉主干（PT）及尖段（S1）肺动脉、后基底段（S10）肺动脉的平均CT 值为（404±104）、（453±119）和（453±119）HU，平均图像背景噪声（11±2）HU，平均检查时间为（0.67±0.09）s，平均辐射剂量为（142±31）mGy cm，明显优于常规组（P＜0.05）。检查图像无呼吸及心脏的运动伪影。肺动脉分支未见完全或部分缺损，所有患者均达到诊断要求。结论自然呼吸下状态高螺距双源CTPA 检查能得到较高质量的图像，没有产生呼吸和心脏的运动伪影，且可避免出现瓦氏（Valsalva）呼吸所致的伪影。 |
| 关键词: 高螺距CT 双源CT CT肺动脉造影 自由呼吸 瓦氏呼吸 |
| DOI： |
| 分类号: |
| 基金项目:浙江省科技厅科技计划 |
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| High-pitch dual-source CT pulmonary angiography in naturally breathing patients |
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DENG Guohui, HU hongjie, ZHANG Wenming, CHEN Bin, HU Jibo
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Sir Run Run Shaw Hospital,Zhejiang University School of Medicine
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| Abstract: |
| Objective To assess the feasibility and image quality of high-pitch dual-source CT pulmonary angiography(CTPA) in naturally breathing patients with suspected pulmonary embolism. Methods One hundred and eight patients with clinically suspected pulmonary embolismunderwent CTPA examination with dual-source CT scanner. Patients were randomly divided into 2 groups: patients in high-pitch group (n=54) received high-pitch CTPA (pitch 3.0, 120 kV, 100 mAs, 50ml contrast material)
without special breathing requirement, patients in routine group (n=54) received normal mode CTPA (pitch 0.8, 120 kV, 100mAs, 80ml contrast material) with inspiratory breath-hold during scanning. PA enhancement, image noise, signal to noise ratio,overall image quality, incidence of total or partial interruption of the contrast column in the PAs, and heart motion-related and breathing-related artifacts of the diaphragm and pulmonary structures were compared between two groups. Results In
high-pitch group，the mean central and peripheral PA attenuation was 404±104 and (453±119) HU, mean image noise was(11±2) HU, mean examination time was (0.67±0.09)s and mean dose-length product was (142±31) mGycm, which were all better than those in routine group (P＜0.05). There were no artifacts of the diaphragmor pulmonary vessels related to breathing or heart motion. There was no case of partial or total interruption of the contrast column in the PA tree. No examination was rated
non-diagnostic in high-pitch group. Conclusion High-pitch dual-source CTPA in naturally breathing patients effectively produces images that are free of artifacts related to breathing and cardiac motion, hence the Valsalva-related artifacts can be eliminated with this technique. |
| Key words: High-pitch computed tomography Dual-source computed tomography Computed tomography pulmonary
angiography Nature breathing Valsalva maneuver |
