By Roland Bruening, Thomas Flohr
Multislice know-how has made it attainable to enquire huge sections of the human physique in a really short while. The four- and 16-row platforms at the moment on hand necessitate using new protocols, that are proposed herein. In a handy double-page structure, this ebook presents dependent details on all regimen protocols to be used for multislice CT. the quantity covers all investigations of the brain, neck, lung and chest, stomach and the outer edge, in addition to distinct protocols for the center, for CT angiography and for CT-guided interventions. every one protocol is displayed en bloc, permitting swift appreciation of the scanner settings and the symptoms.
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Additional info for Protocols for Multislice CT: 4- and 16-row Applications
2. Absence of motion artifacts. Fig. 1. Region: concentrated on central hilar portion, from above the aortic arch Example of Axial Scan Fig. 2 a, b. (Case courtesy of Dr. J. Schoepf ) Caveat 1. The high ﬂow of contrast material injected may cause artifacts from the superior vena cava. 5 s Scan orientation Caudo-cranialb Scanner settings 120 kV, 140 eff. 0 ml/s Scan delay 16 sc Scan time is usually below 15 s, which is well tolerated in breathhold by most patients. Since the sensitive lower parts are scanned ﬁrst, the caudo-cranial scan orientation helps to minimize artifacts from breathing.
2 a–c. (Case courtesy of Dr. B. 5 s Scan orientation Caudo-cranial Scanner settings 120 kV, 90–180 eff. mAs Kernel (algorithm) Soft Window (width/center) 120/45 Contrast medium Yes Administration Monophasic Volume 120 ml Flow rate 3 ml/s Scan delay 100 s Comments This protocol can be used to detect or exclude a thrombosis of the superior sagittal sinus, the sigmoid sinus, or the large cephalic veins. CTA is not capable of detecting or excluding a cavernous sinus thrombosis or of the cephalic veins.
Fig. 1. Region: upper mastoid cells to lower end of mastoid (avoid lenses) Caveats Example of Axial Scan Fig. 2a, b. 1. Patient positioning and gantry tilt must avoid direct exposure of the lenses. 2. The temporal bone needs a separate MPR with an FOV (<9 cm) for each side. 0 s Scan orientation Cranio-caudal Scanner settings 120 kV, 120 eff. mAs Kernel (algorithm) Ultra sharp Window (width/center) 2,000/300 Contrast medium No Administration Volume Flow rate Scan delay Comments In our setting, the axial image data acquisition and the subsequent coronal (and sagittal) MPRs are replacing the image acquisition in both planes.