Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
129 Doctors are Online

Prostate cancer, wants details of bone scan for detection of metastasis - Online Doctor Chats

Date : 13-Jan-2012
User rating for this question
Very Good Posted in: Cancer
Answered by

General & Family Physician
Practicing since : 2005
Answered : 2470 Questions
Doctor :   hi
Doctor :  
how can i help you?
User :   hi
User :   how r u
User :   i have a question
User :   i am not sure which test should i chose
Doctor :  
please proceed with your query
User :   F-18 PET/CT scan or Tc-99m MDP
User :   they r both for bone scanning
Doctor :  
ok
Doctor :  
please provide your age, gender and location
User :   64 male
Doctor :  
for what symptoms was the scan advised?
User :   had a surgery for prostatous cancer
User :   during which prostate was removed
User :   dr. referred for a test
Doctor :  
have you consulted any physician? or orthopedician?
Doctor :  
ok
User :   i have to chose among these 2 test
User :   F-18 PET/CT scan or Tc-99m MDP
Doctor :  
the doctor gave you the prescription/order form for the test?
Doctor :  
then he should have marked which one to undergo
User :   bone scanning and bone lesion identification
User :   dr reffered Tc-99m MDP
Doctor :  
ok
User :   but the nucler department says i can chose to go for F-18 PET/CT scan
Doctor :  
i will help you in this
Doctor :  
the doctor wants to know if the prostate cancer has spread to bone
User :   cuz this one could be better in bone scanning
User :   so i am confused
Doctor :  
ok
Doctor :  
i will guide you in this
Doctor :  
first let me tell you what each of it can do
User :   this is what it says in the paper i got from nuclear test dept
User :   You are invited to participate in a research study of the value of combined F-18 and F-18 FDG PET/CT in detection of cancerous lesions. We hope to learn what is the best approach for detection of cancer and thus to improve cancer treatment. You were selected as a possible subject in this study because you are evaluated for presence of metastases. Your doctor referred you for a Tc-99m MDP bone scan for detection of osseous lesions. If you agree, we will perform an F-18 PET/CT scan for bone lesion identification. Prior research studies demonstrated better lesion detection with F-18 PET/CT than with Tc-99m MDP bone scanning.
Doctor :  
Tc99m MDP bone scan provides high-sensitivity detection of bone metastasis from breast and lung cancers in regular follow-up.
Doctor :   ok
User :   ok
Doctor :  
you can go through what i am saying and come to a conclusion
Doctor :  
Fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT), is based on the glucose metabolism of malignant cells, so, it plays a role in describing tumor growth, proliferation of tumor and the extent of metastasis.
Doctor :   so the F-18 PET/CT scan can detect more accurately the tumor growth and spread pattern.
Doctor :  
Also, F18 FDG PET/CT reveals direct evidence of diffuse, rapid neoplasm metabolism in the bone marrow of the spine.And it is usually used for the follow-up of patients with malignancies.
User :   ok
User :   so which one do u suggest
User :   he had prostatous which was removed and after a blood test dr refered him for test
Doctor :   even the studies made in comparison to both the scan, the F18 FDG PET/CT has emerged with superior results in locating the bone spread
User :   also in f-18 pet/ ct scan it says about riska of radilogy
User :   Your total effective dose will be about 4.5 rems. This dose has an estimated 0.23 percent risk of fatal cancer.
Doctor :  
so it is sugested that you take F18 FDG PET/CT scan for better detection.
Doctor :  
ok
User :   ok tanku dr
User :   are risks same in both
Doctor :  
yes almost the same
User :   as it says Your total effective dose will be about 4.5 rems. This dose has an estimated 0.23 percent risk of fatal cancer.
User :   and its safe normal?
Doctor :  
it is the radiation you will be exposed to
User :   its normal radition that we r exposed during a normal ct scan
Doctor :  
yes
User :   almost same amount
Doctor :  
no
Doctor :  
it will be more as the nuclear radiation is involved
User :   ok
Doctor :  
you can get the details fro the nuclear medicine dept.
User :   but the amount in both the tests are same
User :   ok tanku dr
Doctor :  
but as far as detection of spread of your prostate cancer to bone is concerned, the F18 FDG PET/CT scan will give better results
Doctor :  
Is there any thing else I can help you with?
User :   thats all dr tanx alot
Doctor :   Please fill the feedback form say done when done.
User :   ok
User :   one last question
Doctor :   yes
Doctor :  
please proceed
User :   do u know the amount of radiation in other test
User :   Tc-99m MDP
User :   as u said risks r the same in both so i was concerned
Doctor :  
ok
Doctor :  
i will help you in this
Doctor :  
external radiation with the specific gamma ray constant for Tc 99m is 0.78 R
User :   so its much lower then f18 fdg pet
Doctor :   yes but its detection is also limited.
User :   and the risks would be much lower in tcm 99m
Doctor :  
and it is the external radiation with less penetration than F18 FDG PET/CT scan
User :   sorry cuz i am new in this
Doctor :  
for you the main purpose of the scan is to know the spread of the cancer.
User :   are thr high chances of risks
Doctor :  
and F18 FDG PET/CT scan is with better efficacy
User :   cuz i heard ppl r exposed daily in high radiation by resources around them
User :   ok
Doctor :   and also if the metastasis is not detected well, you will be at a higher risk fronm the cancer than the radiation itself
Doctor :  
as it will be difficult to cure if metastasis goes unnoticed.
User :   ok
User :   tanku
Doctor :   and continues to grow in the bone
User :   dr i got the feed back by mistake i click on very good i wanted to click on excelent
User :   is it possible to send back the feed back
Doctor :  
it is fine . i can send it to you again if you want
Doctor :  
Please chat with our doctors 24/7 for medical queries.
User :   yes i wanted to click excelent
User :   tanx i got it
Doctor :   Thanks for consulting Healthcare Magic. Bye for now. Please refer your friends to our service.
User :   sure i will sign up
User :   tanku very much
User :   and i am done
User :   bye
Doctor :   you are welcome
Doctor :  
wish you a speedy recovery
Doctor :  
bye for now.
Question is related to
Medical Topics
© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor