Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T: Initial experience

Henrik J. Michaely, Harald Kramer, Olaf Dietrich, Kambiz Nael, Klaus Peter Lodemann, Maximilian F. Reiser, Stefan O. Schoenberg

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Abstract

Purpose: To prospectively compare three-dimensional (3D) contrast material-enhanced abdominal magnetic resonance (MR) angiography at 1.5 and 3.0 T intraindividually in healthy volunteers. Materials and Methods: After institutional review board approval and informed consent were obtained, 15 healthy male volunteers (age range, 24-41 years) underwent one abdominal 3D contrast-enhanced MR angiographic examination each at 1.5 and 3.0 T in random order. Fast 3D gradient-echo sequence with parallel imaging acceleration factor of three was used for MR angiography; acquired spatial resolutions were 1 x 0.8 x 1 mm3 (imaging time, 19 seconds) at 1.5 T and 0.9 x 0.8 x 0.9 mm3 (imaging time, 18 seconds) at 3.0 T. With the latter, volume of the 3D slab was 8% larger. At 1.5 T, 20-mL bolus of gadobenate dimeglumine was delivered at 2 mL/sec; at 3.0 T, 15-mL bolus was delivered at 2.5 mL/sec. Two blinded radiologists rated image quality of aorta and proximal renal arteries in consensus with five-point scale (4 = very good, 0 = nondiagnostic) according to sequence and in direct intraindividual comparison. Visibility of proximal and segmental renal arteries was rated with three-point scale (3 = completely visible, 1 = nonvisible). Signal-to-noise ratio (SNR) was determined with phantoms. For statistical analysis of the SNRs, t tests were used. Results: All MR angiographic measurements were diagnostic. Median score for image quality at both field strengths was 4. Depiction of proximal renal arteries was rated 3 at both field strengths. The visibility of the distal renal arteries was better at 3.0 T (median score, 3) than at 1.5 T (median score, 2). With direct comparison, 3.0-T MR angiography was better in 14 of 15 cases; no field strength was preferred in the other case. Mean SNR was significantly (P < .001) higher at 3.0 T (17.8 ± 0.09 [standard deviation]) than at 1.5 T (11.9 ± 0.10). Conclusion: MR angiography at 3.0 T provided better vessel visibility and SNR than did that at 1.5 T, although voxel size and imaging time were reduced.

Original languageEnglish (US)
Pages (from-to)907-913
Number of pages7
JournalRadiology
Volume244
Issue number3
DOIs
StatePublished - Sep 2007
Externally publishedYes

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Magnetic Resonance Angiography
Renal Artery
Signal-To-Noise Ratio
Healthy Volunteers
Magnetic Resonance Spectroscopy
Research Ethics Committees
Informed Consent
Contrast Media
Aorta

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Michaely, H. J., Kramer, H., Dietrich, O., Nael, K., Lodemann, K. P., Reiser, M. F., & Schoenberg, S. O. (2007). Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T: Initial experience. Radiology, 244(3), 907-913. https://doi.org/10.1148/radiol.2443061647

Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T : Initial experience. / Michaely, Henrik J.; Kramer, Harald; Dietrich, Olaf; Nael, Kambiz; Lodemann, Klaus Peter; Reiser, Maximilian F.; Schoenberg, Stefan O.

In: Radiology, Vol. 244, No. 3, 09.2007, p. 907-913.

Research output: Contribution to journalArticle

Michaely, HJ, Kramer, H, Dietrich, O, Nael, K, Lodemann, KP, Reiser, MF & Schoenberg, SO 2007, 'Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T: Initial experience', Radiology, vol. 244, no. 3, pp. 907-913. https://doi.org/10.1148/radiol.2443061647
Michaely, Henrik J. ; Kramer, Harald ; Dietrich, Olaf ; Nael, Kambiz ; Lodemann, Klaus Peter ; Reiser, Maximilian F. ; Schoenberg, Stefan O. / Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T : Initial experience. In: Radiology. 2007 ; Vol. 244, No. 3. pp. 907-913.
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abstract = "Purpose: To prospectively compare three-dimensional (3D) contrast material-enhanced abdominal magnetic resonance (MR) angiography at 1.5 and 3.0 T intraindividually in healthy volunteers. Materials and Methods: After institutional review board approval and informed consent were obtained, 15 healthy male volunteers (age range, 24-41 years) underwent one abdominal 3D contrast-enhanced MR angiographic examination each at 1.5 and 3.0 T in random order. Fast 3D gradient-echo sequence with parallel imaging acceleration factor of three was used for MR angiography; acquired spatial resolutions were 1 x 0.8 x 1 mm3 (imaging time, 19 seconds) at 1.5 T and 0.9 x 0.8 x 0.9 mm3 (imaging time, 18 seconds) at 3.0 T. With the latter, volume of the 3D slab was 8{\%} larger. At 1.5 T, 20-mL bolus of gadobenate dimeglumine was delivered at 2 mL/sec; at 3.0 T, 15-mL bolus was delivered at 2.5 mL/sec. Two blinded radiologists rated image quality of aorta and proximal renal arteries in consensus with five-point scale (4 = very good, 0 = nondiagnostic) according to sequence and in direct intraindividual comparison. Visibility of proximal and segmental renal arteries was rated with three-point scale (3 = completely visible, 1 = nonvisible). Signal-to-noise ratio (SNR) was determined with phantoms. For statistical analysis of the SNRs, t tests were used. Results: All MR angiographic measurements were diagnostic. Median score for image quality at both field strengths was 4. Depiction of proximal renal arteries was rated 3 at both field strengths. The visibility of the distal renal arteries was better at 3.0 T (median score, 3) than at 1.5 T (median score, 2). With direct comparison, 3.0-T MR angiography was better in 14 of 15 cases; no field strength was preferred in the other case. Mean SNR was significantly (P < .001) higher at 3.0 T (17.8 ± 0.09 [standard deviation]) than at 1.5 T (11.9 ± 0.10). Conclusion: MR angiography at 3.0 T provided better vessel visibility and SNR than did that at 1.5 T, although voxel size and imaging time were reduced.",
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AU - Michaely, Henrik J.

AU - Kramer, Harald

AU - Dietrich, Olaf

AU - Nael, Kambiz

AU - Lodemann, Klaus Peter

AU - Reiser, Maximilian F.

AU - Schoenberg, Stefan O.

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N2 - Purpose: To prospectively compare three-dimensional (3D) contrast material-enhanced abdominal magnetic resonance (MR) angiography at 1.5 and 3.0 T intraindividually in healthy volunteers. Materials and Methods: After institutional review board approval and informed consent were obtained, 15 healthy male volunteers (age range, 24-41 years) underwent one abdominal 3D contrast-enhanced MR angiographic examination each at 1.5 and 3.0 T in random order. Fast 3D gradient-echo sequence with parallel imaging acceleration factor of three was used for MR angiography; acquired spatial resolutions were 1 x 0.8 x 1 mm3 (imaging time, 19 seconds) at 1.5 T and 0.9 x 0.8 x 0.9 mm3 (imaging time, 18 seconds) at 3.0 T. With the latter, volume of the 3D slab was 8% larger. At 1.5 T, 20-mL bolus of gadobenate dimeglumine was delivered at 2 mL/sec; at 3.0 T, 15-mL bolus was delivered at 2.5 mL/sec. Two blinded radiologists rated image quality of aorta and proximal renal arteries in consensus with five-point scale (4 = very good, 0 = nondiagnostic) according to sequence and in direct intraindividual comparison. Visibility of proximal and segmental renal arteries was rated with three-point scale (3 = completely visible, 1 = nonvisible). Signal-to-noise ratio (SNR) was determined with phantoms. For statistical analysis of the SNRs, t tests were used. Results: All MR angiographic measurements were diagnostic. Median score for image quality at both field strengths was 4. Depiction of proximal renal arteries was rated 3 at both field strengths. The visibility of the distal renal arteries was better at 3.0 T (median score, 3) than at 1.5 T (median score, 2). With direct comparison, 3.0-T MR angiography was better in 14 of 15 cases; no field strength was preferred in the other case. Mean SNR was significantly (P < .001) higher at 3.0 T (17.8 ± 0.09 [standard deviation]) than at 1.5 T (11.9 ± 0.10). Conclusion: MR angiography at 3.0 T provided better vessel visibility and SNR than did that at 1.5 T, although voxel size and imaging time were reduced.

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