Radiation exposure to operating staff during rotational flat-panel angiography and C-arm cone beam computed tomography (CT) applications

Abstract

PurposeTo evaluate the radiation exposure for operating personel associated with rotational flat-panel angiography and C-arm cone beam CT. Materials and methodsUsing a dedicated angiography-suite, 2D and 3D examinations of the liver were performed on a phantom to generate scattered radiation. Exposure was measured with a dosimeter at predefined heights (eye, thyroid, breast, gonads and knee) at the physician's location. Analysis included 3D procedures with a field of view (FOV) of 24cm×18cm (8s/rotation, 20s/rotation and 5s/2 rotations), and 47cm×18cm (16s/2 rotations) and standard 2D angiography (10s, FOV 24cm×18cm). ResultsMeasurements showed the highest radiation dose at the eye and thyroid level. In comparison to 2D-DSA (3.9μSv eye-exposure), the 3D procedures caused an increased radiation exposure both in standard FOV (8s/rotation: 28.0μSv, 20s/rotation: 79.3μSv, 5s/2 rotations: 32.5μSv) and large FOV (37.6μSv). Proportional distributions were measured for the residual heights. With the use of lead glass, irradiation of the eye lens was reduced to 0.2μSv (2D DSA) and 10.6μSv (3D technique with 20s/rotation). ConclusionRotational flat-panel angiography and C-arm cone beam applications significantly increase radiation exposure to the attending operator in comparison to 2D angiography. Our study indicates that the physician should wear protective devices and leave the examination room when performing 3D examinations.