Photon counting CT: Effects of dynamic beam attenuator on image quality


ATAK H., SHIKHALIEV P. M.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol.867, pp.58-71, 2017 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 867
  • Publication Date: 2017
  • Doi Number: 10.1016/j.nima.2017.04.016
  • Journal Name: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.58-71

Abstract

Purpose: Photon counting (PC) computed tomography (CT) can provide material-selective CT imaging at low patient dose, but it suffers from suboptimal detector count rate. A dynamic beam attenuator (DBA) can help with the count rate by modulating the x-ray beam intensity such that the low attenuating areas of the patient receive lower exposure, and the detector behind these areas is not overexposed. However, DBA may harden the beam and cause artifacts and errors. This work investigates the positive and negative effects of using DBA in PCCT.