What is the difference between a pet scan & a CT scan?

Metabolism & Anatomy. A pet scan is use to evaluate metabolic processes in your body. Currently pet scans are most commonly use to evaluate the glucose metabolism to assess the activity of neoplasms by capturing gamma photons . For this purpose a radioactive form of sugar is injected in the patient. In ct scans external x-rays are use to produce an anatomic image of the body to evaluate size, shape, etc.
Anatomy vs Physiolog. Ct scans look at the structure of the body, the anatomy, and the way diseases change or distort it. Pet looks at the physiology, or how the body uses, or metabolizes something. For pet, the most common metabolism pathway looked at is how glucose is used. A low dose ct is often acquired at the same time as the pet (as in pet/ct scan), to correlate the pet findings with the ct anatomy.
Anatomic/physiologic. Pet scan involves intravenous injection of radio tracer usually f18 fdg.Imaging of whole body occurs for localization of areas of increased glucose metabolism. Malignant tumors usually most active.Ct scan involves x-ray and performs anatomic imaging of parts of body usually head, chest, abdomen, pelvis, or extremities. Pet?Ct combines imaging modalities for anatomic localization of areas of uptake.
PET is functional. A pet scan tells us which cells are taking up glucose which is a measure of functioning. Cancer cells take up too much glucose and other illnesses like dementia have cells that do not take up enough glucose. A ct scan is a structural test and shows the outlines of cells and how big they are. Cts are useful for looking at bones and other sources of calcium.

Related Questions

What is the difference between a pet scan and a CT scan?

Usually done togethr. A pet scan measures the uptake of glucose. The uptake of glucose is increased in most cancers. A ct scan is a basically a series of xrays over the area of interest which provides superb anatomic detail. If a ct scan picks up a mass, it may not be able to tell if it is cancerous or benign. Combining the information with the pet scan allow for superior sensitivity and specificity in detecting tumors. Read more...
Metabolism / Anatomy. A pet scan is an image study that assess glucose metabolism for different tissues in your body using gamma photons while a ct scan is an anatomic picture of your body that reveals size, shape and intensities of organs using x-rays. Pet scans have several indications, including: cancer, cognitive disorders and heart perfusion stress and viability. Read more...
Anatomic/physiologic. Pet scan involves intravenous injection of radio tracer usually f18 fdg.Imaging of whole body occurs for localization of areas of increased glucose metabolism. Malignant tumors usually most active.Ct scan involves x-ray and performs anatomic imaging of parts of body usually head, chest, abdomen, pelvis, or extremities. Pet?Ct combines imaging modalities for anatomic localization of areas of uptake. Read more...

What is the difference between pet scans, mri, ct, and bone/gallium scans?

A lot. Sorry to be so vague. They are very different in what can be seen and what can be diagnosed. Not enough room to go through the details. The Internet has many resources for this information. Try this one: http://www.radiologyinfo.org/ Read more...

I want to know what is the difference between pet scans, mri, ct, and bone/gallium scans?

2 groups. Mri and ct scans are typically looking at the anatomy of a patient, as well as differences in blood flow if contrast is administered. Pet, bone and gallium scans are all looking at the function, or physiology of the patient, and the anatomy is of secondary concern. For example, pet scans are usually using f-18 fdg, a glucose analog, and display differences in glucose use, a main energy source. Read more...
Imaging tests. Ct uses radiation, like multiple x-rays. Mri uses magnets, and is very useful in characterizing soft tissue differences such as in the brain or joints, but also is more expensive and takes much more time. Pet is typically used for cancer imaging as it detects glucose usage by tissue (which is greater in tumors). Bone / gallium uses radiotracer.Best i can explain in 400 letters! Read more...

What are the differences between pet scans, mri, ct, and bone/gallium scans?

Precision. Ct is a great screening tool for imaging the organs. Mri images certain tissues more accurately. Pet uses radioactive material to light up specific tissues. Bone scans use activated agents that are taken up selectively by abnormal tissues. Each technique has it's benefits, risks, and degree of precision. Read more...
Many differences. Mri (magnetic resonance) does not utilize ionizing radiation(ir) characterize tissues, extent of tumor, infection, damage to cartilage/ligaments.Bone scan (ir) finds changes in bone reflecting tumors, fxs, infection( sensitive not specific) .Ct (ir) can localize traumatic changes, tumors, appendicitis, kidney disease.Pet/ct (ir) combo isotope /ct finds subtle metastases and recurrent malignancy, . Read more...
Anatomy vs Physiolog. Mri and ct scans are typically looking at the anatomy of a patient, as well as differences in blood flow if contrast is administered. Pet, bone and gallium scans are all looking at the function, or physiology of the patient, and the anatomy is of secondary concern. For example, pet scans are usually using f-18 fdg, a glucose analog, and display differences in glucose use, a main energy source. Read more...

What is the difference between a cat scan and pet scan?

Physiology. A ct scan is a static picture of anatomy. A pet/ct scan also shows you how metabolically active the " anatomy" is ... Read more...
Anatomy vs Physiolog. Ct scans look at the structure of the body, the anatomy, and the way diseases change or distort it. Pet looks at the physiology, or how the body uses, or metabolizes something. For pet, the most common metabolism pathway looked at is how glucose is used. A low dose ct is often acquired at the same time as the pet (as in pet/ct scan), to correlate the pet findings with the ct anatomy. Read more...
Anatomy / metabolism. CAT scan utilizes xrays for determination of anatomical structures in multiple planes coronal, sagittal, and transaxial. PET scan uses radioactivity with tracer FDG 18 a glucose metabolite to show metabolic areas . Usually malignant lesions are most active. Small metastatic lesions can be detected. Sometimes compared with anatomy with PT CT. Read more...