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مقالات فارسیISIکنفرانسهاژورنالها

Impact of ROI Size on the Accuracy of Noise Measurement in CT on Computational and ACR Phantoms

محل انتشار: مجله فیزیک و مهندسی پزشکی، دوره: 12، شماره: 4
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 33

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استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این مقاله:
https://civilica.com/doc/1892667

شناسه ملی سند علمی:

JR_JBPE-12-4_005

تاریخ نمایه سازی: 30 دی 1402

چکیده مقاله:

Background: The effect of region of interest (ROI) size variation on producing accurate noise levels is not yet studied. Objective: This study aimed to evaluate the influence of ROI sizes on the accuracy of noise measurement in computed tomography (CT) by using images of a computational and American College of Radiology (ACR) phantoms.Material and Methods: In this experimental study, two phantoms were used, including computational and ACR phantoms. A computational phantom was developed by using Matlab R۲۱۵a software (Mathworks Inc., Natick, MA Natick, MA) with a homogeneously +۱۰۰ Hounsfield Unit (HU) value and an added-Gaussian noise with various levels of ۵, ۱۰, ۲۵, ۵۰, ۷۵, and ۱۰۰ HU. The ACR phantom was scanned with a Philips MX-۱۶ slice CT scanner in different slice thicknesses of ۱.۵, ۳, ۵, and ۷ mm to obtain noise variation. Noise measurement was conducted at the center of the phantom images and four locations close to the edge of the phantom images using different ROI sizes from ۳×۳ to ۴۱×۴۱ pixels, with an increased size of ۲×۲ pixels. Results: The use of a minimum ROI size of ۲۱×۲۱ pixels shows noise in the range of ±۵% ground truth noise. The measured noise increases above the ±۵% range if the used ROI is smaller than ۲۱×۲۱ pixels.  Conclusion: A minimum acceptable ROI size is required to maintain the accuracy of noise measurement with a size of ۲۱×۲۱ pixels.

کلیدواژه ها:

ACR Phantom ، Computational Phantom ، Diagnostic Imaging ، Image Quality ، Noise Measurement ، Radiologic Phantoms ، Tomography ، X-Ray Computed ، X-rays

نویسندگان

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PhD, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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PhD, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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MSc, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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MSc, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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MSc, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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MSc, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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PhD, Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang ۵۰۲۷۵, Central Java, Indonesia

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