Top
20
Doctor insights on: Cat Scans And Mri

Share
1

1
How do pet scans, mri, ct, and bone/gallium scans differ?

How do pet scans, mri, ct, and bone/gallium scans differ?

Different mechanisms: Mri uses magnetic radiation( no x-ray) for anatomic localization and characterization of different parts of body, water and fat constitution of different tissues.Ct uses x-ray to characterize anatomy of body, better for bone than mr.Pet, bone, gallium scans use radio tracers intravenously.Petglucose metabolism of tumors, gallium (infection/tumor), bone scan for fxs, tumors, infection bone metabolism. ...Read more

Dr. Ronald Krauser
5 doctors shared insights

Mri (Definition)

Mri or magnetic resonance imaging is one of the more recently developed imaging modalities available to physicians. It uses powerful magnets to generate images. There is no ionizing radiation which is a major advantage over many other modalities. Mri is the best imaging exam that we have for most soft tissue and joint related problems. There are radiologists ...Read more


2

2
How are pet scans , cat scans, and x-rays different?

How are pet scans , cat scans, and x-rays different?

Anatomy v physiology: Ct / x rays show your body's anatomy . Pet shows the metabolism of the anatomy. ...Read more

See 2 more doctor answers
3

3
How are mr scan and a CT scan different?

How are mr scan and a CT scan different?

Contrast difference: Ct uses a combination of xrays shot from multiple directions to look at differences in tissue density. Mri uses strong magnetic fields instead of xrays to differentiate tissues and gives much better contrast than ct. Ct is typically used in the acute setting to see if there is blood or major abnormalities. Mri is a more specific exam to differentiate abnormalities such as stroke or tumor. ...Read more

4

4
Would dementia show up on MRI or cat scan?

Would dementia show up on MRI or cat scan?

Not necessarily: Mri and cat scans show anatomical brain changes only, not functional ones. If a dementia is far enough advanced to change brain structures, it would "show up" on these scans. However, there may be a long decline in brain function before that point is reached. There are functional scans which might detect changes before anatomic anomalies can be seen. A normal MRI does not "rule out" dementia. ...Read more

See 1 more doctor answer
6

6
What are the differences between pet scans, mri, ct, and bone/gallium scans?

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

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

See 2 more doctor answers
7

7
Could MRI and cat scans show metals contained in the brain?

Could MRI and cat scans show metals contained in the brain?

Yes: Both ct and MRI would show metal. Metal would be very bright on ct and cause serious and noticeable artifact on mri. ...Read more

8

8
How are an MRI and CT scan different?

How are an MRI and CT scan different?

Differences: The ct scan uses radiation from multiple x-ray devices to see internal organs. The MRI uses very strong magnetism to orient the body's water molecules and see internal structures such as ligaments, joints, brain, etc. Each study has its own individual benefits or indications. ...Read more

9

9
What are the differences among CT scans, MRI scans and myelograms?

Myleogram: Ct myleogram is a better postop test then mrimyleogram invasive contrast in spinal canal MRI noninvasive. ...Read more

See 3 more doctor answers
10

10
Ct scan, mri, nuclear medicine imaging, ivp scan, how are they different?

Quite different: Ct involves xray type radiation with cross sectional imaging in transaxial, sagittal, and coronal projections. Nuclear medicine, internal irradiation either injected intravenously, inhaled, ingested, injected subcutaneously.Ivp uses injection of contrast material for visualization of kidneys and bladder with x-ray. Mr imaging uses no ionizing radiation magnetic fields to generate x-sectional images. ...Read more

11

11
Mri scan and head CT used for cognitive impairment?

Mri scan and head CT used for cognitive impairment?

Yes: Yes both can be helpful in evaluation of the brain for causes of cognitive impairment although MRI is usually more sensitive. ...Read more

See 1 more doctor answer
12

12
What is the difference between pet scans, mri, ct, and bone/gallium scans?

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

13

13
Is orbital CT scan and CT scan sinus the same?

Not quite: The CT of the sinuses focuses in on the sinuses (though the radiation goes through the entire skull) and generally covers the entire set of sinuses (sphenoid, maxillary, frontal, ethmoid). The orbital CT will cover the eye sockets (and those pictures are zoomed in). While the sinuses lies behind the eyes (& so they overlap), the focus & coverage of these scans are slightly different. ...Read more

See 1 more doctor answer
15

15
What shows up on pet scan but not on cat scan?

What shows up on pet scan but not on cat scan?

Glucose metabolism: PET with F18 FDG, glucose metabolite, determines glucose metabolism of normal and abnormal structures.For example, sometimes lymph nodes are visualized on CT and do no know whether benign or malignant. In general malignant lesions are more active and have higher metabolism of glucose ...Read more

See 3 more doctor answers
16

16
How do a pet scan and a MRI scan differ?

How do a pet scan and a MRI scan differ?

See below: An MRI or magnetic resonance imaging is a study that provides anatomical description of a part of your body. A pet scan can provide further information aside from how it looks or appears. It utilizes radioactive material or tracers that see how cells in your body function. It can detect cancer cells not evident on MRI or ct, heart disease, infection and even neurological conditions like dementia. ...Read more

See 2 more doctor answers
17

17
Can CT scan without contrast show brain aneurysm?

Can CT scan without contrast show brain aneurysm?

Unlikely: Ct scan without contrast is unlikely to show an aneurysm unless it is very large and is calcified. A ct angiogram is a better study to visualize an aneurysm. ...Read more

See 1 more doctor answer
18

18
Can ascities be seen on cat scan or mri?

Can ascities be seen on cat scan or mri?

Yes: Ascities is fluid build up in the abdomen. It can be seen on these tests and also if big enough noted on physical exam. ...Read more

See 2 more doctor answers
19

19
Could MRI or CT scan detect brain cancer?

Could MRI or CT scan detect brain cancer?

Sure: Mri would be the imaging test of choice, though often we start with a ct. Ultimately, you'll likely need a biopsy to prove it's a cancer. ...Read more

20

20
Do CT scans see brain tumors?

Do CT scans see brain tumors?

They can: The diagnostic yield of increased with use of IV contrast material as some tumors disrupt the so called blood brain barrier affording the contrast the ability to infiltrate from the blood stream into the tumor. Small tumors that have not disrupted the integrity of blood vessels may escape detection on CT especially if the have the same radiographic tissue density as their surrounding tissue. ...Read more