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首页> 外文期刊>Radiation Effects and Defects in Solids >Studies on the application of a low-voltage peak to the postsurgical follow-up CT scan in abdominal cancer patients in order to reduce the exposure of patients to radiation
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Studies on the application of a low-voltage peak to the postsurgical follow-up CT scan in abdominal cancer patients in order to reduce the exposure of patients to radiation

机译：低压峰值在腹部癌症患者术后CT扫描中的应用研究，以减少患者的放射线照射

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This study examined the radiation dose, computed tomography (CT) number, contrast and image quality of patients requiring periodic follow-up abdominal CT examinations at various tube voltages. The subjects were divided into two groups. One group consisted of patients who underwent a clinical analysis and the other group was a phantom one. Somatom Sensation 16 (Siemens, Erlangen, Germany) was used. Twenty patients who underwent a periodic follow-up examination by CT were selected randomly. The tube current was fixed to 150 mA, and the tube voltage was adjusted according to the appropriate value of each examination. The computed tomography dose index (CTDI) values were measured. The CT number of each organ was measured by setting up a 1 cm diameter return on investment (ROI) in the abdominal organs at the same height of the first lumbar vertebra using images of the arterial phase. Two radiologists in consensus graded the quality of the abdominal images into three groups. An abdomen-shaped acrylic phantom was used in the phantom study. An ion chamber was inserted into the holes located at the center and periphery of the phantom, where the radiation dose was automatically displayed on the reader. Tube voltages of 80, 100, 120 and 140 kVp were applied to the phantom (diluted contrast medium with water at 1:10 ratio) and the phantom was scanned. The CT number was measured from a 1 cm diameter ROI at the center of the image. The CTDI value decreased by 36% at 100 kVp (7.50 mGy) compared with that at 120 kVp (11.70 mGy). According to the radiologists’ evaluation, there were 17 equivalent, 3 acceptable and 0 unacceptable levels in the group of 20 subjects. The radiation dose in the phantom study decreased with increasing tube voltages from 80 to 140 kVp. The peripheral and central doses decreased by 38% and 41%, respectively. The CT numbers at 80, 100, 120 and 140 kVp were 1365.9±4.4, 1046.1±3.7, 862.8±3.2 and 737.5±3.0 HU, respectively. In conclusion, in a follow-up observation for the detection of a recurrence or metastasis after surgery or patients with chronic abdominal diseases, the exposure doses can be reduced using a low-voltage peak CT examination without greatly changing the image quality.View full textDownload full textKeywordsradiation dose, CT number, CTDI, tube voltageRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10420150.2012.662976
机译：这项研究检查了需要在各种管电压下进行定期定期腹部CT检查的患者的辐射剂量，计算机断层扫描（CT）数量，对比度和图像质量。受试者分为两组。一组由接受临床分析的患者组成，另一组为幻影患者。使用了Somatom Sensation 16（德国埃尔兰根的西门子）。随机选择20例接受CT定期检查的患者。管电流固定为150 mA，并根据每次检查的适当值调整管电压。测量计算机断层扫描剂量指数（CTDI）值。通过使用动脉期图像在第一腰椎的相同高度在腹部器官中建立1厘米直径的投资回报率（ROI）来测量每个器官的CT数。两位放射线医师一致认为，腹部图像的质量分为三组。幻影研究中使用了腹部形状的丙烯酸幻影。将离子室插入位于体模中心和外围的孔中，在此处将辐射剂量自动显示在阅读器上。将管电压分别为80、100、120和140 kVp施加到体模（以1:10的比例用水稀释的造影剂）中，并扫描体模。 CT数是从图像中心的1 cm直径ROI测量的。与在120 kVp（11.70 mGy）相比，CTDI值在100 kVp（7.50 mGy）上降低了36％。根据放射科医生的评估，在20名受试者中，有17个当量水平，3个可接受水平和0个不可接受水平。幻像研究中的辐射剂量随着管电压从80 kVp增加到140 kVp而降低。外周剂量和中心剂量分别降低了38％和41％。在80，100，120和140 kVp的CT数分别为1365.9±4.4、1046.1±3.7、862.8±3.2和737.5±3.0 HU。总而言之，在对手术或慢性腹部疾病患者术后复发或转移进行检测的后续观察中，可以使用低压峰值CT检查减少照射剂量而不会显着改变图像质量。查看全文下载全文关键词关键字辐射剂量，CT编号，CTDI，管电压相关变量var addthis_config = {ui_cobrand：“泰勒和弗朗西斯在线”，servicescompact：“ citeulike，netvibes，twitter，technorati，delicious，linkedin，facebook，stumbleupon，digg，google，更多”， pubid：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/10420150.2012.662976

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