Radiation dose and accuracy analysis of newly developed cone-beam CT for dental and maxillofacial imaging

Abstract

Cone-beam computed tomography (CBCT) has become increasingly popular in dental and maxillofacial imaging due to its accurate 3D information, minimal radiation dose, and low machine cost. In this paper, we have proposed the newly developed CBCT scanner, called DentiiScan. Our gantry system consisting of a cone-beam X-ray source and an amorphous silicon flat panel detector is rotated around a patient's head. With the large area detector, only a single rotation is needed to reconstruct the field-of-view area from chin to eyes and our reconstructed algorithm based on GPU calculation is about 30 times faster than the CPU-based algorithm. The radiation dose was measured and compared to other dental and medical CT machines. The absorbed radiation dose from our proposed CBCT machine is significantly low. In addition, geometric accuracy was analyzed when the test object was scanned at the normal position as well as the inclined position. The results from three observers repeated for five times confirm that the machine can produce reconstructed images with high accuracy.

Quality assurance phantoms for cone beam computed tomography: a systematic literature review

“…The only exception was one phantom containing an object for evaluation of the accuracy for linear measurements, in which the used materials were not stated. 28 In phantoms dedicated to image density measurements, various polymers, such as polyvinylchloride, polytetrafluoroethylene, polypropylene, polyoxymethylene (acetal), polyethylene, low-density polyethylene and nylon, were used. Some phantoms also presented metal parts, mainly used for artefact or geometric accuracy evaluation.…”

A Simple Scatter Reduction Method in Cone-Beam Computed Tomography for Dental and Maxillofacial Applications Based on Monte Carlo Simulation

“…This study used the dental CBCT scanner named DentiiScan 1.1, which was developed in Thailand by the National Science and Technology Development Agency (NSTDA) (Figures 1 and 2) [17, 18]. The system consists of the cone-shaped X-ray source and the amorphous silicon flat panel detector (a-Si FPD) that rotates around a patient.…”

A post-processing method for improving contrast and reducing cupping artifacts in low-energy CBCT images

“…In this work, the DentiiScan system [5] shown in Fig. 1, which is the prototype dental CBCT system developed by Thailand's National Science and Technology Development Agency (NSTDA), was used.…”