2 doctors weighed in:

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

2 doctors weighed in
Dr. Gerald Mandell
Nuclear Medicine

In brief: Nuclear study

Ct radiographic examination by itself is usually more detailed with higher resolution utilizing intravenous contrast material to help differentiate soft tissue abnormalities such as lymph nodes from vascular structures.
Ct combined with pet, is low resolution but helps define areas of increased radiotracer uptake of isotope f18 fdg, glucose metabolite, by allowing anatomic localization.

In brief: Nuclear study

Ct radiographic examination by itself is usually more detailed with higher resolution utilizing intravenous contrast material to help differentiate soft tissue abnormalities such as lymph nodes from vascular structures.
Ct combined with pet, is low resolution but helps define areas of increased radiotracer uptake of isotope f18 fdg, glucose metabolite, by allowing anatomic localization.
Dr. Gerald Mandell
Dr. Gerald Mandell
Thank
Dr. Brian Wosnitzer
Nuclear Medicine

In brief: PET/CT vs. CT

Pet/ct scan has 2 sets of images (pet ; ct images) which are fused for interpretation.
The ct part provides anatomic info while the pet part provides functional info (glucose distribution/metabolic activity). Sometimes the ct part of pet/ct is done as low dose ct without IV or oral contrast. These images are suboptimal compared to a separate dedicated ct with hi dose ; IV and oral contrast.

In brief: PET/CT vs. CT

Pet/ct scan has 2 sets of images (pet ; ct images) which are fused for interpretation.
The ct part provides anatomic info while the pet part provides functional info (glucose distribution/metabolic activity). Sometimes the ct part of pet/ct is done as low dose ct without IV or oral contrast. These images are suboptimal compared to a separate dedicated ct with hi dose ; IV and oral contrast.
Dr. Brian Wosnitzer
Dr. Brian Wosnitzer
Thank
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