Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions download pdf (Page 54)

Bolus Tracking

The Basics

The administration of intravenous (IV) contrast

material during spiral scanning improves the detection

and characterization of lesions, as well as the opacity

of vessels. The contrast scan will yield good results

only if the acquisition occurs during the optimal phase

of enhancement in the region of interest. Therefore,

it is essential to initiate the acquisition with the correct

start delay. Since Multislice spiral CT can provide much

faster speed and shorter acquisition time, it is even

more critical to get the right timing to achieve optimal

results (Fig. 1a,1b).

The dynamics of the contrast enhancement is

determined by:

• Patient cardiac output

• Injection rate (Fig. 2a, 2b)

• Total volume of contrast medium injected

(Fig. 3a, 3b)

• Concentration of the contrast medium (Fig. 3b, 4a)

• Type of injection – uni-phasic or bi-phasic

(Fig. 4a, 4b)

• Patient pathology

Fig. 1a: Longer scan time Fig. 1b: Shorter scan time

40 s scan 10 s scan

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Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 54