Otimização dos protocolos de aquisição de tomografia computadorizada por feixe cônico para redução da dose de radiação
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2022-02-23
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Universidade Federal de Goiás
Resumo
CBCT is influenced by a series of variables such as: the equipment, FOV, exposure time, mA,
kVp and also the spatial resolution defined by the voxel size. As the dose should be as low as
diagnostically possible, it’s reduction is only possible when the image quality is maintained. It
is possible to reduce the radiation dose in patients undergoing dental exams without causing
harmful impact on the image quality and, therefore, on diagnostic accuracy, by changing
exposure parameters in CBCT equipment, so, the optimization of protocols is sought, for each
device, characterized by low radiation dose and high image quality. This study aimed to evaluate
the influence of different CBCT exposure protocols in reducing the radiation dose in a CBCT
equipment while maintaining image quality. For this, medullary follicles were used in
thermoluminescent regions, including radiosensitive regions, including bone, bone, skin,
salivary glands, brain and eyes, eyes visible in an anthropomorphic Alderson RANDO®
phantom. Eight different ones were performed on the Picasso Trio® scanner (Vatech, Hwaseong, South Korea), with different variations of kVp, mA and number of base images. The
effective dose was defined by the International Commission in accordance with Radiological
Protection. A subjective assessment of image quality was performed by three experts. When
comparing the 8 acquisition protocols, the protocol that obtained the lowest values of radiation
DE was protocol 1. The protocol that obtained the highest radiation DE was protocol 8. Protocol
5 (3 mA, 99kVp, 450 IB) proves to be an ideal option among the protocols, due to the low DE
associated with a good score obtained when evaluating image quality More studies are needed
to standardize a methodology in order to compare different equipment.
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SANTOS, A. A. Otimização dos protocolos de aquisição de tomografia computadorizada por feixe cônico para redução da dose de radiação. 2022. 103 f. Tese (Doutorado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2022.