Renal magnetic resonance angiography at 3.0 Tesla using a 32-element phased-array coil system and parallel imaging in 2 directions

Michael Fenchel, Kambiz Nael, Vibhas S. Deshpande, J. Paul Finn, Ulrich Kramer, Stephan Miller, Stefan Ruehm, Gerhard Laub

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

PURPOSE: The aim of the present study was to assess the feasibility of renal magnetic resonance angiography at 3.0 T using a phased-array coil system with 32-coil elements. Specifically, high parallel imaging factors were used for an increased spatial resolution and anatomic coverage of the whole abdomen. MATERIALS AND METHODS: Signal-to-noise values and the g-factor distribution of the 32 element coil were examined in phantom studies for the magnetic resonance angiography (MRA) sequence. Eleven volunteers (6 men, median age of 30.0 years) were examined on a 3.0-T MR scanner (Magnetom Trio, Siemens Medical Solutions, Malvern, PA) using a 32-element phased-array coil (prototype from In vivo Corp.). Contrast-enhanced 3D-MRA (TR 2.95 milliseconds, TE 1.12 milliseconds, flip angle 25-30°, bandwidth 650 Hz/pixel) was acquired with integrated generalized autocalibrating partially parallel acquisition (GRAPPA), in both phase- and slice-encoding direction. Images were assessed by 2 independent observers with regard to image quality, noise and presence of artifacts. RESULTS: Signal-to-noise levels of 22.2 ± 22.0 and 57.9 ± 49.0 were measured with (GRAPPAx6) and without parallel-imaging, respectively. The mean g-factor of the 32-element coil for GRAPPA with an acceleration of 3 and 2 in the phase-encoding and slice-encoding direction, respectively, was 1.61. High image quality was found in 9 of 11 volunteers (2.6 ± 0.8) with good overall interobserver agreement (k = 0.87). Relatively low image quality with higher noise levels were encountered in 2 volunteers. CONCLUSION: MRA at 3.0 T using a 32-element phased-array coil is feasible in healthy volunteers. High diagnostic image quality and extended anatomic coverage could be achieved with application of high parallel imaging factors.

Original languageEnglish (US)
Pages (from-to)697-703
Number of pages7
JournalInvestigative Radiology
Volume41
Issue number9
DOIs
StatePublished - Sep 2006
Externally publishedYes

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Magnetic Resonance Angiography
Noise
Kidney
Volunteers
Abdomen
Artifacts
Healthy Volunteers
Direction compound

Keywords

  • 3 Tesla
  • GRAPPA
  • Magnetic resonance
  • MR angiography
  • MRA
  • Parallel imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Renal magnetic resonance angiography at 3.0 Tesla using a 32-element phased-array coil system and parallel imaging in 2 directions. / Fenchel, Michael; Nael, Kambiz; Deshpande, Vibhas S.; Finn, J. Paul; Kramer, Ulrich; Miller, Stephan; Ruehm, Stefan; Laub, Gerhard.

In: Investigative Radiology, Vol. 41, No. 9, 09.2006, p. 697-703.

Research output: Contribution to journalArticle

Fenchel, Michael ; Nael, Kambiz ; Deshpande, Vibhas S. ; Finn, J. Paul ; Kramer, Ulrich ; Miller, Stephan ; Ruehm, Stefan ; Laub, Gerhard. / Renal magnetic resonance angiography at 3.0 Tesla using a 32-element phased-array coil system and parallel imaging in 2 directions. In: Investigative Radiology. 2006 ; Vol. 41, No. 9. pp. 697-703.
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T1 - Renal magnetic resonance angiography at 3.0 Tesla using a 32-element phased-array coil system and parallel imaging in 2 directions

AU - Fenchel, Michael

AU - Nael, Kambiz

AU - Deshpande, Vibhas S.

AU - Finn, J. Paul

AU - Kramer, Ulrich

AU - Miller, Stephan

AU - Ruehm, Stefan

AU - Laub, Gerhard

PY - 2006/9

Y1 - 2006/9

N2 - PURPOSE: The aim of the present study was to assess the feasibility of renal magnetic resonance angiography at 3.0 T using a phased-array coil system with 32-coil elements. Specifically, high parallel imaging factors were used for an increased spatial resolution and anatomic coverage of the whole abdomen. MATERIALS AND METHODS: Signal-to-noise values and the g-factor distribution of the 32 element coil were examined in phantom studies for the magnetic resonance angiography (MRA) sequence. Eleven volunteers (6 men, median age of 30.0 years) were examined on a 3.0-T MR scanner (Magnetom Trio, Siemens Medical Solutions, Malvern, PA) using a 32-element phased-array coil (prototype from In vivo Corp.). Contrast-enhanced 3D-MRA (TR 2.95 milliseconds, TE 1.12 milliseconds, flip angle 25-30°, bandwidth 650 Hz/pixel) was acquired with integrated generalized autocalibrating partially parallel acquisition (GRAPPA), in both phase- and slice-encoding direction. Images were assessed by 2 independent observers with regard to image quality, noise and presence of artifacts. RESULTS: Signal-to-noise levels of 22.2 ± 22.0 and 57.9 ± 49.0 were measured with (GRAPPAx6) and without parallel-imaging, respectively. The mean g-factor of the 32-element coil for GRAPPA with an acceleration of 3 and 2 in the phase-encoding and slice-encoding direction, respectively, was 1.61. High image quality was found in 9 of 11 volunteers (2.6 ± 0.8) with good overall interobserver agreement (k = 0.87). Relatively low image quality with higher noise levels were encountered in 2 volunteers. CONCLUSION: MRA at 3.0 T using a 32-element phased-array coil is feasible in healthy volunteers. High diagnostic image quality and extended anatomic coverage could be achieved with application of high parallel imaging factors.

AB - PURPOSE: The aim of the present study was to assess the feasibility of renal magnetic resonance angiography at 3.0 T using a phased-array coil system with 32-coil elements. Specifically, high parallel imaging factors were used for an increased spatial resolution and anatomic coverage of the whole abdomen. MATERIALS AND METHODS: Signal-to-noise values and the g-factor distribution of the 32 element coil were examined in phantom studies for the magnetic resonance angiography (MRA) sequence. Eleven volunteers (6 men, median age of 30.0 years) were examined on a 3.0-T MR scanner (Magnetom Trio, Siemens Medical Solutions, Malvern, PA) using a 32-element phased-array coil (prototype from In vivo Corp.). Contrast-enhanced 3D-MRA (TR 2.95 milliseconds, TE 1.12 milliseconds, flip angle 25-30°, bandwidth 650 Hz/pixel) was acquired with integrated generalized autocalibrating partially parallel acquisition (GRAPPA), in both phase- and slice-encoding direction. Images were assessed by 2 independent observers with regard to image quality, noise and presence of artifacts. RESULTS: Signal-to-noise levels of 22.2 ± 22.0 and 57.9 ± 49.0 were measured with (GRAPPAx6) and without parallel-imaging, respectively. The mean g-factor of the 32-element coil for GRAPPA with an acceleration of 3 and 2 in the phase-encoding and slice-encoding direction, respectively, was 1.61. High image quality was found in 9 of 11 volunteers (2.6 ± 0.8) with good overall interobserver agreement (k = 0.87). Relatively low image quality with higher noise levels were encountered in 2 volunteers. CONCLUSION: MRA at 3.0 T using a 32-element phased-array coil is feasible in healthy volunteers. High diagnostic image quality and extended anatomic coverage could be achieved with application of high parallel imaging factors.

KW - 3 Tesla

KW - GRAPPA

KW - Magnetic resonance

KW - MR angiography

KW - MRA

KW - Parallel imaging

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