A rational approach to dose reduction in CT: individualized scan protocols View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-12

AUTHORS

Janita E. Wilting, André Zwartkruis, Maarten S. van Leeuwen, Jan Timmer, Alfons G. Kamphuis, Michiel Feldberg

ABSTRACT

The aim of this study was to demonstrate that dose reduction and constant image quality can be achieved by adjusting X-ray dose to patient size. To establish the relation between patient size, image quality and dose we scanned 19 patients with reduced dose. Image noise was measured. Four radiologists scored image quality subjectively, whereby a higher score meant less image quality. A reference patient diameter was determined for which the dose was just sufficient. Then 22 patients were scanned with the X-ray dose adjusted to their size. Again, image noise was measured and subjective image quality was scored. The dose reduction compared with the standard protocol was calculated. In the first group the measured noise was correlated to the patient diameter (rho=0.78). This correlation is lost in the second group (rho=-0.13). The correlation between patient diameter and subjective image quality scores changes from rho=0.60 (group 1) to rho=-0.69 (group 2). Compared with the standard protocol, the dose was reduced (mean 28%, range 0-76%) in 19 of 22 patients (86%). Dose reduction and constant noise can be achieved when the X-ray dose is adjusted to the patient diameter. With constant image noise the subjective image quality increases with larger patients. More... »

PAGES

2627-2632

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003300101039

DOI

http://dx.doi.org/10.1007/s003300101039

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042975442

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11734970


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