scholarly journals Clinical Advantages of Using Low Tube Voltage in Third-Generation 192-Slice Dual-Source Computed Tomographic Angiography Before Transcatheter Aortic Valve Implantation

2019 ◽  
Vol 60 (5) ◽  
pp. 1091-1097
Author(s):  
Hiroshi Onoda ◽  
Hiroshi Ueno ◽  
Masahiko Hashimoto ◽  
Hiroyuki Kuwahara ◽  
Mitsuo Sobajima ◽  
...  
Keyword(s):  
Computed Tomographic Angiography ◽  
Third Generation ◽  
Tube Voltage ◽  
Computed Tomographic ◽  
Low Tube Voltage ◽  
Transcatheter Aortic Valve ◽  
Dual Source ◽  
Aortic Valve Implantation ◽  
Tomographic Angiography ◽  
Valve Implantation

Radiation Dose Reduction with a Low-Tube Voltage Technique for Pediatric Chest Computed Tomographic Angiography Based on the Contrast-to-Noise Ratio Index

2018 ◽  
Vol 69 (4) ◽  
pp. 390-396
Author(s):  
Takanori Masuda ◽  
Yoshinori Funama ◽  
Takeshi Nakaura ◽  
Masahiro Tahara ◽  
Yukari Yamashita ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Computed Tomographic Angiography ◽  
Image Noise ◽  
Tube Voltage ◽  
Dose Length Product ◽  
Computed Tomographic ◽  
Low Tube Voltage ◽  
Pediatric Chest ◽  
The Mean ◽  
Tomographic Angiography

Introduction The aim of this study was to evaluate the radiation dose and image quality at low tube-voltage pediatric chest computed tomographic angiography (CTA) that applies the same contrast-to-noise ratio (CNR) index as the standard tube voltage technique. Materials and Methods Contrast-enhanced chest CTA scans of 100 infants were acquired on a 64-row multidetector computed tomography (MDCT) scanner. In the retrospective study, we evaluated 50 images acquired at 120 kVp; the image noise level was set at 25 Hounsfield units. In the prospective study, we used an 80-kVp protocol; the image noise level was 40 Hounsfield units because the iodine contrast was 1.6 times higher than on 120-kVp scans; the CNR was as in the 120-kVp protocol. We compared the CT number, image noise, CT dose index volume (CTDIvol), and the dose-length product on scans acquired with the 2 protocols. A diagnostic radiologist and a pediatric cardiologist visually evaluated all CTA images. Results The mean CTDIvol and the mean dose-length product were 0.5 mGy and 7.8 mGy-cm for 80- and 1.2 mGy and 20.8 mGy-cm for 120-kVp scans, respectively ( P < .001). The mean CTDIvol was 42% lower at 80 kVp than at 120 kVp, and there was no significant difference in the visual scores assigned to the CTA images ( P = .28). Conclusions With the CNR index being the same at 80-kVp and 120-kVp imaging, the radiation dose delivered to infants subjected to chest CTA can be reduced without degradation of the image quality.

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