Abstract
Purpose Quantitative and qualitative analysis of gadopentetate dimeglumine (GD) versus standard-dose (sGb) and half-dose (hGb) gadobutrol in thoracoabdominal time-resolved contrast-enhanced magnetic resonance angiography (4D-MRA) with dynamic computed tomography (dCT) as the quantitative reference in minipigs. Materials and Methods 7 anesthetized Goettingen minipigs received thoracoabdominal dCT (0.37s rotation time) and transverse 4D-MRA (0.3s/dynamic frame;) using sGb and hGb. 8 other minipigs received coronal 4D-MRA (1.3s/dynamic frame; sGb, hGb, SGD). dCT attenuation levels were converted into absolute gadolinium concentrations and compared to 4D-MRA peak signal intensities (SI). Bolus lengths were quantified by full width at half maximum (FWHM) measurements. After this comparison of dose effects on SI in transverse 4D-MRA, coronal 4D-MRAs were analyzed regarding both quantitative and qualitative parameters. Results In dCT (transverse 4D-MRA) hGb showed 39.0% (14.5%) lower arterial peak gadolinium concentrations (peak SIs) and 20.6% (33.8%) shorter FWHM compared to sGb. The difference was due to peak plateaus or reversals in 4D-MRA in 5/7 animals. While sGb led to the highest peak SIs, image quality ratings of arteries were rated similarly high with all contrast agent protocols despite a slightly higher SI with sGb. In contrast, venous peak SIs and image quality ratings were significantly higher when using sGb. Conclusion Peak Gd concentrations and 4D-MRA peak SIs are highest with sGB. These differences are most evident in the venous phase leading to superior image quality in multi-phase 4D-MRA. Key Points: Standard-dose gadobutrol offers high vascular gadolinium concentrations and 4D-MRA peak signals. Absolute vascular gadolinium concentrations and 4D-MRA peak signal intensities at 3T diverge. Peak plateaus or reversals cause decreased arterial 4D-MRA peak signals at 3T. Arterial image quality is rated similarly high using different contrast agent protocols. Venous vessel visibility in 4D-MRA is significantly better using standard dose gadobutrol. Citation Format Hadizadeh DR, Keil VC, Jost G etal. Contrast Media in Time-Resolved MRA at 3T: A Systematic Quantitative and Qualitative Analysis of Concentration and Dose Effects on Image Parameters in Minipigs. Fortschr Röntgenstr 2018; 190: 747-757.
Original language | English |
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Pages (from-to) | 747-757 |
Number of pages | 11 |
Journal | Rofo-fortschritte auf dem gebiet der rontgenstrahlen und der bildgebenden verfahren |
Volume | 190 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Aug 2018 |
Externally published | Yes |
Keywords
- Animals
- Aorta/diagnostic imaging
- Contrast Media/administration & dosage
- Dose-Response Relationship, Drug
- Evaluation Studies as Topic
- Female
- Gadolinium DTPA/administration & dosage
- Image Enhancement/methods
- Image Interpretation, Computer-Assisted
- Magnetic Resonance Angiography/methods
- Male
- Organometallic Compounds/administration & dosage
- Qualitative Research
- Swine
- Swine, Miniature
- Time Factors
- Tomography, X-Ray Computed