Effect of miscentering and low-dose protocols on contrast resolution in computed tomography head examination

Unoptimized protocols, including a miscentered position, might affect the outcome of diagnostic in CT examinations. In this study, we investigate the effects of miscentering position during CT head examination on the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). We simulate the CT h...

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Bibliographic Details
Published in:Computers in biology and medicine 2020-08, Vol.123, p.103840-103840, Article 103840
Main Authors: Shaffiq Said Rahmat, Said Mohd, Abdul Karim, Muhammad Khalis, Che Isa, Iza Nurzawani, Abd Rahman, Mohd Amiruddin, Noor, Noramaliza Mohd, Hoong, Ng Kwan
Format: Article
Language:English
Subjects:
CNR
Computed tomography
Computer simulation
CT head
Diagnostic systems
Digital imaging
Head
Head injuries
Image quality
Measurement techniques
Medical imaging
Miscentered position
Noise
Optimization
Quality
Scanners
Signal to noise ratio
SNR
Standard deviation
Values
Variance analysis
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Summary:Unoptimized protocols, including a miscentered position, might affect the outcome of diagnostic in CT examinations. In this study, we investigate the effects of miscentering position during CT head examination on the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). We simulate the CT head examination using a water phantom with a standard protocol (120 kVp/180 mAs) and a low dose protocol (100 kVp/142 mAs). The table height was adjusted to simulate miscentering by 5 cm from the isocenter, where the height was miscentered superiorly (MCS) at 109, 114, 119, and 124 cm, and miscentered inferiorly (MCI) at 99, 94, 89, and 84 cm. Seven circular regions of interest were used, with one drawn at the center, four at the peripheral area of the phantom, and two at the background area of the image. For the standard protocol, the mean CNR decreased uniformly as table height increased and significantly differed (p 
ISSN:0010-4825
1879-0534
DOI:10.1016/j.compbiomed.2020.103840