The Optimization of Scan Timing for Contrast-Enhanced Magnetic Resonance Angiography
Korean Journal of Radiology
;
: 142-151, 2000.
Article
in English
| WPRIM
| ID: wpr-8988
ABSTRACT
OBJECTIVE:
To determine the optimal scan timing for contrast-enhanced magnetic resonance angiography and to evaluate a new timing method based on the arteriovenous circulation time. MATERIALS ANDMETHODS:
Eighty-nine contrast-enhanced magnetic resonance angiographic examinations were performed mainly in the extremities. A 1.5T scanner with a 3-D turbo-FLASH sequence was used, and during each study, two consecutive arterial phases and one venous phase were acquired. Scan delay time was calculated from the time-intensity curve by the traditional (n = 48) and/or the new (n = 41) method. This latter was based on arteriovenous circulation time rather than peak arterial enhancement time, as used in the traditional method. The numbers of first-phase images showing a properly enhanced arterial phase were compared between the two methods.RESULTS:
Mean scan delay time was 5.4 sec longer with the new method than with the traditional. Properly enhanced first-phase images were found in 65% of cases (31/48) using the traditional timing method, and 95% (39/41) using the new method. When cases in which there was mismatch between the target vessel and the time-intensity curve acquisition site are excluded, erroneous acquisition occurred in seven cases with the traditional method, but in none with the new method.CONCLUSION:
The calculation of scan delay time on the basis of arteriovenous circulation time provides better timing for arterial phase acquisition than the traditional method.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Time Factors
/
Image Processing, Computer-Assisted
/
Magnetic Resonance Angiography
/
Contrast Media
/
Gadolinium DTPA
/
Injections, Intravenous
/
Middle Aged
Limits:
Female
/
Humans
/
Male
Language:
English
Journal:
Korean Journal of Radiology
Year:
2000
Type:
Article
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