[Questionnaire Survey on the Response to the Reduction of the Equivalent Dose Limit of the Crystalline Lens in the Tokai Region].

Purpose: We conducted a questionnaire survey on the measures to be taken after the reduction of the equivalent dose limit for lenses to clarify the current situation at each institution and to discuss future dose control and exposure protection for lenses.

Methods: A questionnaire survey was conducted among medical institutions in the Tokai area. A total of 65 items, including personal dosimeters, protective eyewear, imaging conditions, and protective equipment, were included in the survey.

[Questionnaire Survey on IVR Dose Management in Tokai Region].

Purpose: National diagnostic reference levels in Japan 2020 (DRLs 2020) have been published. In the field of angiography, in addition to the fluoroscopic dose rate, incident air kerma at the patient entrance reference point displayed on the equipment (K: mGy) and air kerma-area product displayed on the equipment (P: Gycm) were set. A questionnaire survey was conducted at each facility in the Tokai region to confirm the status of medical radiation dose control in the region.

[Examination of Dose Reduction Using Image Noise Reduction Technology in Cardiovascular X-ray Systems].

The aim of this study is to establish radiation exposure dose reduction protocols during cardiac intervention by decreasing the entrance dose at flat panel detector (FPD) with image quality evaluations. For measuring entrance surface dose (ESD), we have used a Radical 9015 dosimeter (6 cc ion chamber) placed under 20 cm thick acrylic plates at the patient's entrance reference point. We performed an image quality assessment based on quantitative as well as visual evaluation of the images obtained via current and dose reduction protocols.

Evaluation of Entrance Skin Dose during Catheter Ablation Procedures by Use of Reference Air-Kerma Displayed on Angiography Systems.

Background: Our aim in this study was to estimate entrance skin doses (ESDs) to patients who underwent catheter ablation procedures, by using a reference air-kerma (RAK) displayed on the monitor of an angiography system (displayed RAK).

Methods: The displayed RAK was calibrated with use of an air-kerma value measured on a 20-cm-thick acrylic plate at the interventional reference point for the inclusion of backscattered x-rays (calibrated RAK). The ESD evaluated from the calibrated RAK (evaluated ESD) was verified through direct ESD measurements on an anthropomorphic phantom.