Combined large field-of-view MRA and time-resolved MRA of the lower extremities

• Verfasst von: Riffel, Philipp [VerfasserIn]
• Verfasst von: Haneder, Stefan [VerfasserIn]
• Verfasst von: Attenberger, Ulrike [VerfasserIn]
• Verfasst von: Brade, Joachim [VerfasserIn]
• Verfasst von: Schönberg, Stefan [VerfasserIn]
• Verfasst von: Michaely, Henrik J. M. [VerfasserIn]
• Titel: Combined large field-of-view MRA and time-resolved MRA of the lower extremities
• Titelzusatz: impact of acquisition order on image quality
• Verf.angabe: Philipp Riffel, Stefan Haneder, Ulrike I. Attenberger, Joachim Brade, Stefan O. Schoenberg, Henrik J. Michaely
• Jahr: 2012
• Jahr des Originals: 2012
• Umfang: 5 S.
• Fussnoten: Available online 18 December 2011 ; Available online 18 December 2011 ; Gesehen am 26.06.2018
• Titel Quelle: Enthalten in: European journal of radiology
• Ort Quelle: Amsterdam [u.a.] : Elsevier Science, 1990
• Jahr Quelle: 2012
• Band/Heft Quelle: 81(2012), 10, Seite 2754-2758
• ISSN Quelle: 1872-7727
• DOI: doi:10.1016/j.ejrad.2011.12.003
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: CTM MRA
• Sach-SW: Low-dose protocol
• Sach-SW: Peripheral MR angiography
• Sach-SW: TWIST MRA
• K10plus-PPN: 1576839133

Abstract

Purpose Different approaches exist for hybrid MRA of the calf station. So far, the order of the acquisition of the focused calf MRA and the large field-of-view MRA has not been scientifically evaluated. Therefore the aim of this study was to evaluate if the quality of the combined large field-of-view MRA (CTM MR angiography) and time-resolved MRA with stochastic interleaved trajectories (TWIST MRA) depends on the order of acquisition of the two contrast-enhanced studies. Methods In this retrospective study, 40 consecutive patients (mean age 68.1±8.7 years, 29 male/11 female) who had undergone an MR angiographic protocol that consisted of CTM-MRA (TR/TE, 2.4/1.0ms; 21° flip angle; isotropic resolution 1.2mm; gadolinium dose, 0.07mmol/kg) and TWIST-MRA (TR/TE 2.8/1.1; 20° flip angle; isotropic resolution 1.1mm; temporal resolution 5.5s, gadolinium dose, 0.03mmol/kg), were included. In the first group (group 1) TWIST-MRA of the calf station was performed 1-2min after CTM-MRA. In the second group (group 2) CTM-MRA was performed 1-2min after TWIST-MRA of the calf station. The image quality of CTM-MRA and TWIST-MRA were evaluated by 2 two independent radiologists in consensus according to a 4-point Likert-like rating scale assessing overall image quality on a segmental basis. Venous overlay was assessed per examination. Results In the CTM-MRA, 1360 segments were included in the assessment of image quality. CTM-MRA was diagnostic in 95% (1289/1360) of segments. There was a significant difference (p<0.0001) between both groups with regard to the number of segments rated as excellent and moderate. The image quality was rated as excellent in group 1 in 80% (514/640 segments) and in group 2 in 67% (432/649), respectively (p<0.0001). In contrast, the image quality was rated as moderate in the first group in 5% (33/640) and in the second group in 19% (121/649) respectively (p<0.0001). The venous overlay was disturbing in 10% in group 1 and 20% in group 2 (p=n.s.). Conclusion If a combined hybrid MRA approach with large field-of-view and time-resolved MRA is acquired the large field-of-view MRA should be acquired first in order for optimal image quality.