Impact of Iterative Reconstruction Algorithms on Image Quality and Radiation Dose in Computed Tomography Scan of Patients with Malignant Pancreatic Lesions
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 71
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شناسه ملی سند علمی:
JR_JMSI-12-1_007
تاریخ نمایه سازی: 28 تیر 1402
چکیده مقاله:
Background: The objective of this study was to investigate the influence of iterative
reconstruction (IR) algorithm on radiation dose and image quality of computed tomography (CT)
scans of patients with malignant pancreatic lesions by designing a new protocol. Methods: The
pancreas CT was performed on ۴۰ patients (۲۳ males and ۱۷ females) with a ۱۶۰‑slice CT scan
machine. The pancreatic parenchymal phase was performed in two stages: one with a usual dose
of radiation and the other one after using a reduced dose of radiation. The images obtained with
usual dose were reconstructed with Filtered Back Projection (FBP) method (Protocol A); and the
images obtained with the reduced dose were reconstructed with both FBP (Protocol B) and IR
method (Protocol C). The quality of images and radiation dose were compared among the three
protocols. Results: Image noise was significantly lower with Protocol C (۱۰.۸۰) than with Protocol
A (۱۴.۹۸) and Protocol B (۲۰.۶۰) (P < ۰.۰۰۱). Signal‑to‑noise ratio and contrast‑to‑noise ratio were
significantly higher with Protocol C than with Protocol A and Protocol B (P < ۰.۰۰۱). Protocol A
and Protocol C were not significantly different in terms of image quality scores. Effective dose
was reduced by approximately ۴۸% in Protocol C compared with Protocol A (۱.۲۰ ± ۰.۵۳ mSv vs.
۲.۳۳ ± ۰.۸۶ mSv, P < ۰.۰۰۱). Conclusion: Results of this study showed that applying the IR method
compared to the FBP method can improve objective image quality, maintain subjective image quality,
and reduce the radiation dose of the patients undergo pancreas CT.
کلیدواژه ها:
نویسندگان
Mohamadhosein Asemanrafat
Department of Medical Physics, Isfahan University of Medical Sciences, Isfahan
Ali Chaparian
Department of Medical Physics, Isfahan University of Medical Sciences, Isfahan
Mehrzad Lotfi
Department of Radiology, Shiraz University of Medical Sciences, Shiraz, Iran
Alireza Rasekhi
Department of Radiology, Shiraz University of Medical Sciences, Shiraz, Iran