[Biphasic liver diagnosis with multiplanar-detector spiral CT].
OBJECTIVE
Scan protocol optimization and value of a multi-row-detector helical CT (MS-CT) in comparison to a single-row-detector spiral CT (SS-CT) for imaging of focal liver lesions.


METHODS
The ability of a MS-CT with different scan parameters (slice thickness, scan mode, table-speed, reconstruction interval) for the detection of low-contrast objects was evaluated with a liver phantom and compared to a SS-CT. The clinical value (detection and characterization) of MS-CT with various slice thicknesses (3.75, 5, 7.5 mm) was compared intraindividually in 20 patients with a total of 43 benign and malignant lesions.


RESULTS
In the experimental study the MS-CT reached the same detection rates for low-contrast objects despite a three-times faster scan-time compared to a SS-CT. The slice thicknesses of 3.75 and 5 mm proved to be optimal and were superior to a thickness of 7.5 mm for the detection and characterization of liver lesions. A distinct separation between arterial and portal venous phase was achieved by this protocol.


CONCLUSIONS
The MS-CT allows a reliable acquisition of the entire liver parenchyma in defined perfusion phases. It improves the detection and characterization of focal liver lesions with optimized scan parameters with a significantly faster scan time than with the SS-CT.
Kopka
L
L
Abteilung Röntgendiagnostik I, Klinikum der Georg-August-Universität Göttingen.
Grabbe
E
E
D000328:Adult; D006528:Carcinoma, Hepatocellular / Q000000981:diagnostic imaging; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D006801:Humans; D007472:Iohexol / Q000008:administration & dosage / Q000031:analogs & derivatives; D008099:Liver / Q000000981:diagnostic imaging*; D008113:Liver Neoplasms / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging / Q000706:statistics & numerical data; D015898:Tomography Scanners, X-Ray Computed / Q000706:statistics & numerical data; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods / Q000706:statistics & numerical data
D003287:Contrast Media; D007472:Iohexol; C038192:iopromide
Biphasische Leberdiagnostik mit der Mehrzeilendetektor-Spiral-CT.