NetForum uses cookies to ensure that we give you the best experience on our website. If you continue to use the site, we'll assume that you are happy to receive these cookies on the NetForum website. Read about our cookies.
NetForum Community
Learn. Share. Optimize.
Log in | Sign up now | Submit content | Contact
Go to similar content

Patient-specific cardiovascular MDCT dose maps and their utility in estimating organ and effective doses in obese patients

Publication
Philips CT Clinical Science Philips Healthcare • USA

Thompson CM, Yanof JH, Wiegert J, Bullen J, Obuchowski N, Yaddanapudi K, Halliburton SS.

* This aricle originally appeared in the January 2016 edition the the Journal of Cardivascular Computed Tomography.
Background
Estimates of effective dose (E) for cardiovascular CT are obtained from a scanner-provided dose metric, the dose-length product (DLP), and a conversion factor. These estimates may not adequately represent the risk of a specific scan to obese adults.

Objective
Our objective was to create dose maps sensitive to patient size and anatomy in the irradiated region from a patient's own CT images and compare measured E (EDoseMap) to doses determined from standard DLP conversion (EDLP) in obese adults.

Methods
21 obese patients (mean body mass index, 39 kg/m²) underwent CT of the pulmonary veins, thoracic aorta, or coronary arteries. DLP values were converted to E. A Monte Carlo tool was used to simulate X-ray photon interaction with virtual phantoms created from each patient's image set. Organ doses were determined from dose maps. EDoseMap was computed as a weighted sum of organ doses multiplied by tissue-weighting factors.

Results
EDLP (mean ± SD, 5.7 ± 3.3 mSv) was larger than EDoseMap (3.4 ± 2.4 mSv) (difference = 2.3; P < .001).

Conclusion
Dose maps derived from patient CT images yielded lower effective doses than DLP conversion methods. Considering over all patient size, organ size, and tissue composition could lead to better dose metrics for obese patients.
For more information about this publication, check out the PubMed listing for this article.


This content has been made possible by NetForum Community.
Share this on: Share your link in twitter Share your link in facebook Share your link on LinkedIn Print Rate this article: Log in to vote

 
Rating:
Votes:
0
Views:
800
Added:
Feb 28, 2016

Rate this:
Log in to vote
 

Publication
iCT
aorta, Cardiac, chest, chest CTA, coronary angiography, coronary arteries, dose, phantom, pulmonary imaging, Pulmonary Vein, thoracic aorta, Vascular
 

Clinical News
Best Practices
Case Studies
Publications and Abstracts
White Papers
Web seminars and Presentations
ExamCards
Protocols
Application Tips and FAQ
Training
Try an Application
Business News
Case Studies
White Papers
Web Seminars and Presentations
Utilization Services
Contributing Professionals
Contributing Institutions
Become a Contributor