Dual Source CT - Perfusion Defect Visualization with Spiral Dual Energy Scanning
SOMATOM Definition Dual Energy scanning
A 76 year-old male presented with sudden onset of dyspnea to the Emergency Department. Pulmonary embolism was suspected and the patient was referred to our Department for CT pulmonary angiography. A Dual Source CT scan of the thorax was performed on the SOMATOM Definition using spiral Dual Energy evaluation.
After the Dual Energy scan, massive pulmonary
In the Dual Energy mode two x-ray sources are operated simultaneously at different kV levels of 80 kV and 140 kV. The resulting two spiral data sets acquired in a single scan provide diverse information, which allows differentiating, characterizing, isolating and distinguishing the imaged tissue and material. In the thorax, Dual Energy mode allows investigating lung perfusion after iodinated contrast medium injection. In patients with pulmonary embolism, the Dual Energy mode provides new areas of research, as both morphologic and functional information on the effect of intravascular clots on lung perfusion are obtained using a single modality.
Fig 1+2: Excellent visualization of perfusion defects – made possible by Spiral Dual Energy scanning.
|Scan length ||342 mm|
|Scan time ||8 s|
|Scan direction ||Caudo-cranial|
140 kV and 80 kV
|Effective mAs ||51 eff. mAs / 213 eff. mAs|
Reconstructed slice thickness
|Increment ||0.5 mm|
|CTDIvol ||6.96 mGy|
100 ml Enhance / 50 ml NaCl
|Contrast Flow rate ||5 ml/sec|
|Start Delay ||CARE Bolus|
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