Cone beam CT with zonal filters for simultaneous dose reduction, improved target contrast and automated set-up in radiotherapy

Physics in Medicine and Biology
C J MooreAli Amer

Abstract

Cone beam CT (CBCT) using a zonal filter is introduced. The aims are reduced concomitant imaging dose to the patient, simultaneous control of body scatter for improved image quality in the tumour target zone and preserved set-up detail for radiotherapy. Aluminium transmission diaphragms added to the CBCT x-ray tube of the Elekta Synergytrade mark linear accelerator produced an unattenuated beam for a central "target zone" and a partially attenuated beam for an outer "set-up zone". Imaging doses and contrast noise ratios (CNR) were measured in a test phantom for transmission diaphragms 12 and 24 mm thick, for 5 and 10 cm long target zones. The effect on automatic registration of zonal CBCT to conventional CT was assessed relative to full-field and lead-collimated images of an anthropomorphic phantom. Doses along the axis of rotation were reduced by up to 50% in both target and set-up zones, and weighted dose (two thirds surface dose plus one third central dose) was reduced by 10-20% for a 10 cm long target zone. CNR increased by up to 15% in zonally filtered CBCT images compared to full-field images. Automatic image registration remained as robust as that with full-field images and was superior to CBCT coned down using lead-coll...Continue Reading

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Citations

Nov 26, 2010·Medical Physics·Dimitrios Lazos, Jeffrey F Williamson
Dec 11, 2013·Medical Physics·Steven Bartolac, David Jaffray
Jan 26, 2012·Medical Physics·Steven BartolacDavid Jaffray
Sep 12, 2008·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Raj SripadamPat Price
Mar 16, 2007·Clinical Oncology : a Journal of the Royal College of Radiologists·C McCarthyH R Gattamaneni
Sep 14, 2017·Medical Physics·Aymeric ReshefIsabelle Bloch
Oct 1, 2008·Physics in Medicine and Biology·T E MarchantP C Williams

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