Contrast Media in Time-Resolved MRA at 3T: A Systematic Quantitative and Qualitative Analysis of Concentration and Dose Effects on Image Parameters in Minipigs

Dariusch Reza Hadizadeh, Vera Catharina Keil, Gregor Jost, Hubertus Pietsch, Martin Weibrecht, Christian Marx, Winfried Willinek

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)747-757
Number of pages11
JournalRofo-fortschritte auf dem gebiet der rontgenstrahlen und der bildgebenden verfahren
Volume190
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018
Externally publishedYes

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

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