Abstract
The aim of this study was to compare image noise properties of GE Discovery HD 750 and Toshiba Aquilion ONE. The uniformity section of a Catphan 600 image quality assurance phantom was scanned with both scanners, at different dose levels and with extension rings simulating patients of different sizes. 36 datasets were obtained and analyzed in terms of noise power spectrum. All the results prove that introduction of extension rings significantly altered the image quality with respect to noise properties. Without extension rings, the Toshiba scanner had lower total visible noise than GE (with GE as reference: FC18 had 82% and FC08 had 80% for 10 mGy, FC18 had 77% and FC08 74% for 15 mGy, FC18 had 80% and FC08 77% for 20 mGy). The total visible noise (TVN) for 20 and 15 mGy were similar for the phantom with the smallest additional extension ring, while Toshiba had higher TVN than GE for the 10 mGy dose level (120% FC18, 110% FC08). For the second and third ring, the GE images had lower TVN than Toshiba images for all dose levels (Toshiba TVN is greater than 155% for all cases). The results indicate that GE potentially has less image noise than Toshiba for larger patients. The Toshiba FC18 kernel had higher TVN than the Toshiba FC08 kernel with additional beam hardening correction for all dose levels and phantom sizes (120%, 107%, and 106% for FC18 compared to 110%, 98%, and 97%, for FC08, for 10, 15 and 20 mGy doses, respectively).PACS number(s): 87.57.Q‐, 87.57.nf, 87.57.C‐
Highlights
IntroductionThe Computed tomography (CT) usage worldwide has increased rapidly in the last decades.[1,2] CT is the imaging modality with the highest radiation dose among medical radiography techniques,(3) and CT examinations may increase the additional risk of cancer for patients.[4,5,6] the radiation dose should be as low as possible while at the same time, obtaining the diagnostic information vital for patient safety.[7] all the CT vendors have improved the CT technology to improve image quality and reduce radiation dose over the last decade
Computed tomography (CT) is widely used for medical diagnostic purposes
As new CT scanners are introduced in a radiological department in a hospital, optimizing the image quality can be challenging because the image texture is different for different scanners
Summary
The CT usage worldwide has increased rapidly in the last decades.[1,2] CT is the imaging modality with the highest radiation dose among medical radiography techniques,(3) and CT examinations may increase the additional risk of cancer for patients.[4,5,6] the radiation dose should be as low as possible while at the same time, obtaining the diagnostic information vital for patient safety.[7] all the CT vendors have improved the CT technology to improve image quality and reduce radiation dose over the last decade. The different vendors have different scanner designs, different technological platforms, and different reconstruction algorithms, resulting in different image quality at equal dose level, even if the scan parameter settings are as similar as possible and the scanned object is the same. The aim of this study was to compare image noise texture for different reconstruction kernels, different dose levels, and different phantom diameters for two different CT scanners to objectively evaluate differences in image noise properties between these two CT scanners
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