Low-tube-voltage (80 kVp) CT aortography using 320-row volume CT with adaptive iterative reconstruction: lower contrast medium and radiation dose

被引:65
作者
Chen, Chien-Ming [1 ]
Chu, Sung-Yu [1 ]
Hsu, Ming-Yi [1 ]
Liao, Ying-Lan [2 ]
Tsai, Hui-Yu [3 ,4 ,5 ]
机构
[1] Chang Gung Univ, Dept Med Imaging & Intervent, Chang Gung Mem Hosp Linkou, Coll Med, Tao Yuan 333, Taiwan
[2] Natl Tsing Hua Univ, Dept Biomed Engn & Environm Sci, Hsinchu, Taiwan
[3] Chang Gung Univ, Dept Med Imaging & Radiol Sci, Coll Med, Tao Yuan 333, Taiwan
[4] Chang Gung Univ, Hlth Aging Res Ctr, Tao Yuan 333, Taiwan
[5] Chang Gung Univ, Dept Med Imaging & Radiol Sci, Tao Yuan 333, Taiwan
关键词
Volume computed tomography; Contrast media; Aortic aneurysm; Radiation dosage; Radiographic image enhancement; COMPUTED-TOMOGRAPHY ANGIOGRAPHY; FILTERED BACK-PROJECTION; IMAGE-QUALITY; ABDOMINAL CT; PATIENT WEIGHT; CHEST CT; ENHANCEMENT; REDUCTION; EXPOSURE; FLUSH;
D O I
10.1007/s00330-013-3027-3
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
100231 [临床病理学]; 100902 [航空航天医学];
摘要
To evaluate CT aortography at reduced tube voltage and contrast medium dose while maintaining image quality through iterative reconstruction (IR). The Institutional Review Board approved a prospective study of 48 patients who underwent follow-up CT aortography. We performed intra-individual comparisons of arterial phase images using 120 kVp (standard tube voltage) and 80 kVp (low tube voltage). Low-tube-voltage imaging was performed on a 320-detector CT with IR following injection of 40 ml of contrast medium. We assessed aortic attenuation, aortic attenuation gradient, image noise, contrast-to-noise ratio (CNR), volume CT dose index (CTDIvol), and figure of merit (FOM) of image noise and CNR. Two readers assessed images for diagnostic quality, image noise, and artefacts. The low-tube-voltage protocol showed 23-31 % higher mean aortic attenuation and image noise (both P < 0.01) than the standard-tube-voltage protocol, but no significant difference in the CNR and aortic attenuation gradients. The low-tube-voltage protocol showed a 48 % reduction in CTDIvol and an 80 % increase in FOM of CNR. Subjective diagnostic quality was similar for both protocols, but low-tube-voltage images showed greater image noise (P = 0.01). Application of IR to an 80-kVp CT aortography protocol allows radiation dose and contrast medium reduction without affecting image quality. aEuro cent CT aortography at 80 kVp allows a significant reduction in radiation dose. aEuro cent Addition of iterative reconstruction reduces image noise and improves image quality. aEuro cent The injected contrast medium dose can be substantially reduced at 80 kVp. aEuro cent Aortic enhancement is uniform despite a reduced volume of contrast medium.
引用
收藏
页码:460 / 468
页数:9
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