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. 2024 Jun;78(3):215-225.
doi: 10.18926/AMO/67196.

Assessment of a New Elbow Joint Positioning Method Using Area Detector Computed Tomography

Takuya Akagawa  1   2 , Ryohei Fukui  3 , Katsuhiro Kida  3 , Ryutaro Matsuura  3 , Makoto Shimada  4 , Mitsuhiro Kinoshita  5 , Yoko Akagawa  5 , Sachiko Goto  3
Affiliations
Free article

Assessment of a New Elbow Joint Positioning Method Using Area Detector Computed Tomography

Takuya Akagawa et al. Acta Med Okayama. 2024 Jun.
Free article

Abstract

We propose a sitting position that achieves both high image quality and a reduced radiation dose in elbow joint imaging by area detector computed tomography (ADCT), and we compared it with the 'superman' and supine positions. The volumetric CT dose index (CTDIvol) for the sitting, superman, and supine positions were 2.7, 8.0, and 20.0 mGy and the dose length products (DLPs) were 43.4, 204.7, and 584.8 mGy • cm, respectively. In the task-based transfer function (TTF), the highest value was obtained for the sitting position in both bone and soft tissue images. The noise power spectrum (NPS) of bone images showed that the superman position had the lowest value up to approx. 1.1 cycles/mm or lower, whereas the sitting position had the lowest value when the NPS was greater than approx. 1.1 cycles/mm. The overall image quality in an observer study resulted in the following median Likert scores for Readers 1 and 2: 5.0 and 5.0 for the sitting position, 4.0 and 3.5 for the superman position, and 4.0 and 2.0 for the supine position. These results indicate that our proposed sitting position with ADCT of the elbow joint can provide superior image quality and allow lower radiation doses compared to the superman and supine positions.

Keywords: area detector computed tomography; dose reduction; elbow joint; image quality assessment; sitting position.

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Conflict of interest statement

No potential conflict of interest relevant to this article was reported.

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