Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy.

Institutional imaging protocols for the verification of brachytherapy applicator placements were investigated in a survey study of domestic radiotherapy institutions. The survey form designed by a free on-line survey system was distributed via the mailing-list system of the Japanese Society for Radiation Oncology. Survey data of 75 institutions between August 2019 and October 2019 were collected.

[Application of the PET for Radiation Therapy].

Because radiotherapy is local treatment, it is very important to define target volume and critical organs based on accurate lesion area. The PET using an index such as the SUV is quantifiable noninvasively with information of the molecular biology for individual case/lesion. In particular, PET with 18F-fluorodeoxyglucose (FDG-PET) has been used for the diagnosis and treatment evaluation of various tumors.