An investigation of the iterative reconstruction method iDose4 on a Philips CT Brilliance 64 using a Catphan 600 phantom

Marie-Louise Olsson; Kristina Norrgren

doi:10.1117/12.910889

23 February 2012 An investigation of the iterative reconstruction method iDose⁴ on a Philips CT Brilliance 64 using a Catphan 600 phantom

Marie-Louise Olsson, Kristina Norrgren

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 831348 (2012) https://doi.org/10.1117/12.910889
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

The number of CT examinations giving a relatively high patient exposure is increasing. It is therefore important to optimize the imaging conditions at these investigations. Many steps have been taken to reduce the radiation doses in CT examinations. Currently much work is related to iterative image reconstruction methods as alternative to the filtered back projection method. The aim of this work was to evaluate quality parameters in images from a CT (Philips Brilliance 64) equipped with the iterative reconstruction method iDose4 using a Catphan 600 phantom with and without body simulating ring. CT scans using abdomen protocol were taken with various tube currents and tube voltage and keeping collimation and pitch unchanged for all scans. All collected data were reconstructed with different levels of iDose4 (Level 2, 4, 6) and traditional filtered back projection. Image quality parameters were evaluated using AutoQA Lite ^TM (Version 2.3 2007 Iris QA, LLC). Results from the study shows that the iterative reconstruction method decreases the noise with 15-45% compared with filtered back projection depending on which level of iDose⁴ is used. The percentage reduction in noise level is the same with and without body simulating ring. Low contrast was improved with iDose⁴ and spatial resolution is only marginally affected by the method of reconstruction. However by reducing the image noise, the detectability can be improved. Our conclusion is that there is great potential to reduce the noise and thereby improve the image quality by using iterative reconstruction methods. This can also be used to lower radiation dose and maintain image quality or improve image quality.

Citation Download Citation

Marie-Louise Olsson and Kristina Norrgren "An investigation of the iterative reconstruction method iDose⁴ on a Philips CT Brilliance 64 using a Catphan 600 phantom", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831348 (23 February 2012); https://doi.org/10.1117/12.910889

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available