Assessment of potential dose reduction in multidetector CT doses using FBP and SAFIRE for detection and measurement of position of the inferior alveolar canal

Journal Article

2020

Published in: https://doi.org/10.1016/j.oooo.2019.09.002

AA, Al-Ekrish . 2020

Objective:The objective was to identify the lowest doses required to detect and measure the position of the inferior alveolar canal (IAC) on multidetector computed tomography (MDCT) images using filtered backprojection (FBP) and sinogram-affirmed iterative reconstructions (SAFIRE) 3 and SAFIRE 5.
Study Design: Four cadaveric mandibles were imaged using a reference protocol with standard dose and FBP and 3 ultra-lowdose protocols (LD1-LD3), using an MDCT scanner. All test examinations were reconstructed with FBP, SAFIRE 3, and SAFIRE 5. Subjective visibility of the IAC in the images and digital measurements of the height of the ridge above the IAC were recorded from test images and compared with those from the reference image using one-sample t tests, Bland-Altman plots, and linear regression.
Results: Subjective visibility comparable to the standard protocol was obtained with an 84.6% dose reduction using the LD2 protocol. No statistically significant difference was found between the height measurements from the reference protocol and any of the LD1 and LD2 protocols. The t tests indicated a significant difference between the measurements from the reference and all LD3 test protocols. SAFIRE did not have an advantage over FBP images.
Conclusions: Significant dose reduction from the reference dose can allow adequate detection and measurements of the IAC.

• Publication Work Type: Original Research
• Volume Number: 129
• Issue Number: 1
• Magazine \ Newspaper: Oral Surgery Oral Medicine Oral Pathology Oral Radiology
• Pages: 65-71