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

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. Contrast-enhanced chest CTA scans of 100 infants wer...

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Bibliographic Details
Published in:Canadian Association of Radiologists journal 2018-11, Vol.69 (4), p.390-396
Main Authors: Masuda, Takanori, Funama, Yoshinori, Nakaura, Takeshi, Tahara, Masahiro, Yamashita, Yukari, Kiguchi, Masao, Imada, Naoyuki, Sato, Tomoyasu, Awai, Kazuo
Format: Article
Language:eng ; fre
Subjects:
Angiography
Chest
Child, Preschool
Computation
Computed tomography
Computed Tomography Angiography - instrumentation
Computed Tomography Angiography - methods
Contrast-to-noise ratio
Diagnostic systems
Electric potential
Female
Humans
Image acquisition
Image contrast
Image quality
Infant
Infant, Newborn
Infants
Iodine
Low-tube-voltage
Male
Medical imaging
Multidetector Computed Tomography - instrumentation
Multidetector Computed Tomography - methods
Noise levels
Pediatric computed tomographic angiography
Radiation
Radiation Dosage
Radiation dose reduction
Radiography, Thoracic - methods
Radiology
Retrospective Studies
Tomography
Voltage
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Summary: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. 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. 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 
ISSN:0846-5371
1488-2361
DOI:10.1016/j.carj.2018.05.004