Otimização dos protocolos de aquisição de tomografia computadorizada por feixe cônico para redução da dose de radiação

• Autor(a) principal: Santos, Ananda Amaral
• Data de Publicação: 2022
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/12483
• topic: Dose de radiação; Dosimetria; Tomografia computadorizada de feixe cônico; Radiação; Radiation dosage; Dosimetry; Cone-beam computed tomography; Radiation; CIENCIAS DA SAUDE::ODONTOLOGIA::CLINICA ODONTOLOGICA

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.