Fast digital recording of X-ray dilution curves: a preliminary evaluation.

Hübener, K.-H.; Kalender, Willi A.; Metzger, Hans-Geert

doi:10.1148/radiology.145.2.7134469

Cited by 4 publications

(2 citation statements)

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“…Another approach to individualize CT data acquisition is by means of a prelim- inary contrast test bolus [13,14]. This technique, also known as CT chronography [16], has several disadvantages. First, it increases the duration of the examination.…”

Section: Discussionmentioning

confidence: 99%

Optimizing liver contrast in helical liver CT: value of a real-time bolus-triggering technique

et al. 1998

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Optimal liver enhancement during portal venous-phase helical CT is crucial in the detection of parenchymal liver lesions. In the prospective study reported here we investigated the effects of a real-time bolus-tracking system on mean and maximal liver enhancement. In 79 patients referred to us for abdominal CT we injected 120 ml of non-ionic contrast (300 mg I/ml) at a rate of 3 ml/s. After a nonintravenous contrast upper abdominal scan a portal venous phase was performed. In 39 patients (mean weight 72.6 +/- 18.7 kg, range 48-139 kg) real-time bolus tracking was performed using the CARE Bolus software (Siemens, Erlangen, Germany). The software performs repetitive low-dose test scans in a preselected region of interest and measures the Hounsfield attenuation and liver enhancement in real-time. After a critical threshold (we selected 31 HU) is surpassed, the software starts diagnostic spiral scanning. Our control consisted of 40 patients weighing 51-100 kg (mean 73.2 +/- 11.1 kg) who were scanned with a fixed, preselected start delay of 80 s. Mean hepatic enhancement was 54.0 +/- 9.9 HU (range 33.3-74 HU) in 37 automatically triggered patients, mean peak hepatic enhancement 64.6 +/- 12.6 HU (range 42.0-91.8 HU). In 2 patients of the study group scanning had to be started manually. In the control group with fixed delay mean enhancement was 48.3 +/- 9.2 HU (range 33.8-71.6 HU) and peak enhancement 55.5 +/- 9.7 HU (range 39.7-81.0 HU). Differences were significant (p < 0.05, Student's t-test). Real-time bolus tracking significantly increased mean hepatic enhancement and may improve portal venous hepatic CT scanning.

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Section: Discussionmentioning

confidence: 99%

Optimizing liver contrast in helical liver CT: value of a real-time bolus-triggering technique

et al. 1998

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“…To overcome these problems, three methods were developed in the literature to individualize scan timing during constant-speed spiral CT angiography (Schweiger et al, 1998): (1) test bolus timing, (2) ROI threshold triggering, and (3) visual cue triggering. The test bolus method may decrease lesion conspicuity due to equilibration by the test bolus (Kopka et al, 1996;Hubener et al, 1982). The two triggering methods are vulnerable to patient motion, usually related to breathing, which may displace the target organ or vessel from the scan plane (Kopka et al, 1996;Schweiger et al, 1998;Silverman et al, 1996).…”

Section: Introductionmentioning

confidence: 99%