Principles Of

PET is a functional imaging modality that employs radiotracers to exploit altered metabolic and biochemical function in vivo. Until the early 1990s, because of a limited axial field of view within the scanner, the technique was reserved almost exclusively for neuropsychiatric and cardiac research. With the advent of a simple change in scanner design, which allowed passage of the scanning couch through the gantry, it became possible to perform whole-body PET. Subsequently oncological imaging has...

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Figure 4 Pathologically proved benign lymph node in a patient with prostate cancer. Axial MR images, obtained with a 3 mm section thickness before (A) and after (B) administration of ferumoxtran-10 show a node (circle) with peripheral uptake of contrast material and a prominent central fatty hilum. Thin sections allow robust nodal characterization. Source From Ref. 12. Figure 4 Pathologically proved benign lymph node in a patient with prostate cancer. Axial MR images, obtained with a 3 mm...

Fundamental Advantages of MDCT

Blood Thinners Hold Times

The first advantage of MDCT is the ability to scan a lot faster while acquiring a dataset with similar slice thickness and image quality to that of SDCT. Faster table speeds are particularly advantageous in patients with reduced breath-holding capacity since table speeds on the order of 50 to 70 mm per second are achievable. Fast table speeds are often chosen in the setting of trauma, in patients with dyspnea, in young children or in those patients in whom there are communication difficulties...