A Phantom-based investigation into the influence of low tube potential and matrix size on radiation dose and image quality for a 128 slice abdominopelvic Ct protocol

Panakkal, Nitika C and Rajagopal, KV and Sukumar, Suresh and Ravishankar, N (2022) A Phantom-based investigation into the influence of low tube potential and matrix size on radiation dose and image quality for a 128 slice abdominopelvic Ct protocol. Malaysian Journal of Medicine and Health Sciences, 18 (2). pp. 14-19. ISSN 1675-8544

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Abstract

Introduction: Reducing radiation dose for CT examinations has been accompanied by an increase in image noise. Studies have highlighted the application of a higher matrix size for improving image quality when assessing the lungs. This study aims to evaluate the influence of a low kVp and higher matrix size on radiation dose and image quality for abdominopelvic CT. Methods: This experiment was done on a 32 cm body phantom and scanned using a 128 slice CT scanner. The study utilised various combinations of kVp settings (140, 120, 100, 80 & 70) and matrix sizes (1024, 768 & 512). The image obtained was analysed objectively and subjectively. For objective analysis, we calculated SNR, and CNR. For subjective analysis, two radiologists evaluated the image in a 3-point scoring scale. Results: The study reported an increase in SNR (0.8%) and CNR (46%) at 120 kVp when increasing the matrix size from 512 x 512 to 768 x 768. Similarly, there was an increase of 14.5 % and 56.4 % in CNR and SNR using 1024 matrix size. The DLP was reduced by 4.5%, 50% and 70.6 % using 100, 80 and 70 kVp respectively. However, there was no change in DLP with higher matrix sizes. Conclusion: The study reported a combination of 100 kVp and 768 matrix size resulted in an almost similar (↓0.9 %) SNR and improved CNR (↑46.4 %) compared to 120 kVp and 512 matrix size. Qualitative analysis also showed a similar image quality with decreased radiation dose for abdominopelvic CT.

Item Type: Article
Uncontrolled Keywords: Image matrix; radiation dose; image quality; abdominopelvic CT; dose length product (DLP).
Subjects: Allied Health > MCOAHS Manipal > Medical Imaging Tech
Departments at MU > Public Health
Medicine > KMC Manipal > Radiology
Depositing User: KMC Library
Date Deposited: 06 Jun 2022 12:25
Last Modified: 06 Jun 2022 12:25
URI: http://eprints.manipal.edu/id/eprint/158790

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