News  |  Journals  |  Conferences  |  Blogs  |  Articles  |  Forums  |  Twitter   
 

 Headlines:

 
 

Doctors Lounge - Oncology Answers

"The information provided on www.doctorslounge.com is designed to support, not replace, the relationship that exists between a patient/site visitor and his/her physician."

Back to Oncology Answers List

Forum Name: Endocrine Cancers

Question: AC Attenuation Correction Thickness on a PET/CT Scan Slide


 donna p - Tue Jan 13, 2009 6:58 pm

General query, Please: attenuation correction thickness refers to a length between slides on a ct scan or thickness of a tumor? PET/CT results translated. Thank you.
 Faye Lang, RN, MSW - Fri Mar 20, 2009 2:20 pm

Hello Donna,

The term attenuation in a CT or PET scan refers to what happens when a beam of radiation passes through matter. The beam decreases. So, attenuation correction thickness is to allow for that decrease in establishing the thickness of whatever is being scanned.

I hope this helps you.

Faye, RN, MSW
 dyagernpc - Sun Mar 22, 2009 11:51 am

In CT-based attenuation correction, CT data are acquired over the area of the body to be scanned with PET and are reconstructed into a series of transverse CT images. A multilinear transformation is applied to estimate the linear attenuation coefficient at 511 keV (µ511) from the CT numbers (Hounsfield units). After the transformation is applied, these data are smoothed to a degree comparable to the resolution of PET to minimize edge artifacts. The resulting transformed and smoothed images are then forward-projected to generate the CT-based attenuation correction file, which is applied to the emission data.
Basically, the attenuation correction is the final image based on the merged computed data from the PET and CT scans which highlights tumors or "hot spots".

http://radiology.rsnajnls.org/cgi/conte ... type=HWCIT
 donna p - Thu Jul 16, 2009 12:26 am

Faye Lang, RN, MSW wrote:Hello Donna,

The term attenuation in a CT or PET scan refers to what happens when a beam of radiation passes through matter. The beam decreases. So, attenuation correction thickness is to allow for that decrease in establishing the thickness of whatever is being scanned.

I hope this helps you.

Faye, RN, MSW


i.e. a tumor, Faye, in a head and neck ct/pet, CTAC 3.75 THICK in slide annotation; I am not being facetious. Thanks for the response kindly, Donna P.
 Faye Lang, RN, MSW - Tue Aug 10, 2010 9:14 pm

Hi donna p,

Thank you for the update. I'm sorry to hear that there is a tumor involved. I wish you (or the person involved) successful treatment and recovery.

Best wishes,

|

Check a doctor's response to similar questions

 

advertisement.gif (61x7 -- 0 bytes)
 

Are you a Doctor, Pharmacist, PA or a Nurse?

Join the Doctors Lounge online medical community

  • Editorial activities: Publish, peer review, edit online articles.

  • Ask a Doctor Teams: Respond to patient questions and discuss challenging presentations with other members.

Doctors Lounge Membership Application

 
     

 advertisement.gif (61x7 -- 0 bytes)

 

 

Tools & Services: Follow DoctorsLounge on Twitter Follow us on Twitter | RSS News | Newsletter | Contact us

 
Copyright © 2001-2010
Doctors Lounge.
All rights reserved.

Medical Reference:
Diseases | Symptoms
Drugs | Labs | Procedures
Software | Tutorials

Advertising
Links | Humor
Forum Archive
CME Articles

Privacy Statement
Terms & Conditions
Editorial Board
About us | Email

We subscribe to the HONcode principles of the HON Foundation. Click to verify.We subscribe to the HONcode principles.
Verify here