Direct and fast measurement of CT beam filter profiles with simultaneous geometrical calibration.

ABSTRACT:

Purpose

To accurately measure the beam filter profiles from a variety of CT scanner models and to provide reference data for Monte Carlo simulations of CT scanners.

Methods

This study proposed a new method to measure CT beam filter profiles using a linear-array x-ray detector (X-Scan 0.8f3-512; Detection Technology Inc., Espoo, Finland) under gantry rotation mode. A robust geometrical calibration approach was developed to determine key geometrical parameters by considering the x-ray focal spot location relative to the linear-array detector and the gantry's angular increment at each acquisition point. CT beam intensity profiles were synthesized from continuously measured data during a 10° gantry rotation range with calibrated detector response and system geometry information.

SUBMITTER: Yang K 

PROVIDER: S-EPMC5543987 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature