Impact of prone, supine and oblique patient positioning on CBCT image quality, contrast to noise ratio and figure of merit value in the maxillofacial region.

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Impact of prone, supine and oblique patient positioning on CBCT image quality, contrast to noise ratio and figure of merit value in the maxillofacial region.

Dentomaxillofac Radiol. 2017 Mar 17;:20160418

Authors: Koivisto J, van Eijnatten M, Järnstedt J, Holli-Helenius K, Dastidar P, Wolff J

Abstract
OBJECTIVES: To assess the impact of supine, prone and oblique patient imaging positions on the image quality, contrast-to-noise ratio and figure of merit value in the maxillofacial region using a cone beam computed tomography scanner. Furthermore, the CBCT supine images were compared to supine MSCT images.
METHODS: One fresh frozen cadaver head was scanned in prone, supine and oblique imaging positions using a mobile CBCT scanner. MSCT images of the head were acquired in a supine position. Two radiologists graded the CBCT and MSCT images at ten different anatomical sites according to their image quality using a six-point scale. CNR and FOM values were calculated at two different anatomical sites on the CBCT and MSCT images.
RESULTS: The best image quality was achieved in prone imaging position for sinus, mandible and maxilla, followed by supine and oblique imaging positions. 12-mA prone images presented high delineation scores for all anatomical landmarks, except for the ear region (carotid canal), which presented adequate to poor delineation scores for all studied head positions and exposure parameters. The MSCT scanner offered similar image qualities to the 7.5-mA supine images acquired using the mobile CBCT scanner. The prone imaging position offered the best CNR and FOM values on the mobile CBCT scanner.
CONCLUSIONS: Head positioning has an impact on CBCT image quality. The best CBCT image quality can be achieved using the prone and supine imaging positions. The oblique imaging position offers inadequate image quality except in the sinus region.

PMID: 28306334 [PubMed - as supplied by publisher]

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