Head and neck effective dose and quantitative assessment of image quality: a study to compare Cone Beam CT and Multislice Spiral CT.

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Head and neck effective dose and quantitative assessment of image quality: a study to compare Cone Beam CT and Multislice Spiral CT.

Dentomaxillofac Radiol. 2017 May 16;:20170030

Authors: Nardi C, Talamonti C, Pallotta S, Saletti P, Calistri L, Cordopatri C, Colagrande S

Abstract
OBJECTIVES: To evaluate the effective dose and image quality of horizontal Cone Beam CT (CBCT) in comparison with Multislice Spiral CT (MSCT) in head, cervical spine, ear and dental arches scans.
METHODS: Head and neck Alderson-Rando phantom equipped with seventy-four thermoluminescence dosimeters was exposed according to five different scans in CBCT and four different scans in MSCT. Spatial and contrast resolution, in terms of Modulation Transfer Function (MTF) and Contrast-to-Noise Ratio (CNR), were measured to obtain a quantitative assessment of image quality.
RESULTS: CBCT effective dose was 248 µSv, 249 µSv, 361 µSv, 565 µSv, and 688 µSv in cervical spine, head, ear, dental arches with small FOV, and dental arches with medium FOV, respectively. MSCT effective dose was 3409 µSv, 1892 µSv, 660 µSv, and 812 µSv in cervical spine, head, ear, and dental arches, respectively. MTF was 0.895 vs. 0.347, 0.895 vs. 0.275, 0.875 vs. 0.342, and 0.961 vs. 0.352 for CBCT vs. MSCT in cervical spine, head, ear, and dental arches, respectively. Head and cervical spine MSCT showed greater CNR than CBCT, whereas CNR of ear and dental arches showed comparable values.
CONCLUSIONS: CBCT was preferable to MSCT for the ear and dental arches volumetric imaging, due to its lower radiation dose and significantly higher spatial resolution. In the case of cervical spine and head imaging, MSCT should be generally recommended if a high contrast resolution is required, despite the greater radiation exposure.

PMID: 28511564 [PubMed - as supplied by publisher]

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