Siemens Software version syngo CT 2005C manual Hints in General

Thorax

Hints in General

•Topogram: TOP, 512 mm.

•Patient positioning: Patient lying in supine position, arms positioned comfortably above the head in the head-arm rest, lower legs supported.

•Contrast medium administration: in general, IV injections are employed in all mediastinal examina- tions, but not in routine high resolution studies of diffuse interstitial lung diseases. An IV contrast medium injection improves the vascular opacifica- tion and facilitates the visualization of the lesions, lymph nodes and the vessels.

•Stasis of contrast medium in the arm & superior vena cava often result in high density streak artifacts either in the region of the aortic arch or in the region of the subclavian vein. A caudo-cranial (bottom to top) scanning direction should be used to reduce this artifact – by simply acquiring the data in this region at the later phase of the spiral scan. In addition, if the patient cannot hold his/her breath for the duration of the entire scan, breathing motion will be less appar- ent in the apex than in the lower lobes.

•CARE Bolus may be used to optimize the bolus tim- ing. Set the ROI for monitoring scan in the aorta at the level of the diaphragm with triggering threshold of 120 HU, or use manual triggering.

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