Fast multi-planar gradient echo MR imaging: impact of variation in pulse sequence parameters on image quality and artifacts
The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR)...
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Published in | Magnetic resonance imaging Vol. 22; no. 6; pp. 807 - 814 |
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Format | Journal Article |
Language | English |
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01.07.2004
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Abstract | The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR). We developed a composite phantom with different T
1 and T
2 values comprising the range of common biological tissues, which was also subjected to periodic motion in order to evaluate motion effects. Magnetic resonance imaging was performed on a GE Signa 1.5-T system. Experimental variations in key parameters included excitation flip angle (FL), echo time (TE), repetition time (TR), and receive bandwidth (BW). Quantitative analysis consisted of signal-to-noise-ratio (SNR) and contrast (CN), image nonuniformity (NU), full-width-at-half-maximum (FWHM) (i.e., blurring or geometric distortion), and ghosting ratio (GR). We found that flip angle, TE, and TR play particularly critical roles in determining image signal, homogeneity, and ghosting artifact with these sequences. Optimum clinical application of these pulse sequences requires careful attention to these imaging parameters and to their complex interactions. |
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AbstractList | The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR). We developed a composite phantom with different T sub(1) and T sub(2) values comprising the range of common biological tissues, which was also subjected to periodic motion in order to evaluate motion effects. Magnetic resonance imaging was performed on a GE Signa 1.5-T system. Experimental variations in key parameters included excitation flip angle (FL), echo time (TE), repetition time (TR), and receive bandwidth (BW). Quantitative analysis consisted of signal-to- noise-ratio (SNR) and contrast (CN), image nonuniformity (NU), full-width-at- half-maximum (FWHM) (i.e. blurring or geometric distortion), and ghosting ratio (GR). We found that flip angle, TE, and TR play particularly critical roles in determining image signal, homogeneity, and ghosting artifact with these sequences. Optimum clinical application of these pulse sequences requires careful attention to these imaging parameters and to their complex interactions. The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR). We developed a composite phantom with different T(1) and T(2) values comprising the range of common biological tissues, which was also subjected to periodic motion in order to evaluate motion effects. Magnetic resonance imaging was performed on a GE Signa 1.5-T system. Experimental variations in key parameters included excitation flip angle (FL), echo time (TE), repetition time (TR), and receive bandwidth (BW). Quantitative analysis consisted of signal-to-noise-ratio (SNR) and contrast (CN), image nonuniformity (NU), full-width-at-half-maximum (FWHM) (i.e., blurring or geometric distortion), and ghosting ratio (GR). We found that flip angle, TE, and TR play particularly critical roles in determining image signal, homogeneity, and ghosting artifact with these sequences. Optimum clinical application of these pulse sequences requires careful attention to these imaging parameters and to their complex interactions. The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR). We developed a composite phantom with different T 1 and T 2 values comprising the range of common biological tissues, which was also subjected to periodic motion in order to evaluate motion effects. Magnetic resonance imaging was performed on a GE Signa 1.5-T system. Experimental variations in key parameters included excitation flip angle (FL), echo time (TE), repetition time (TR), and receive bandwidth (BW). Quantitative analysis consisted of signal-to-noise-ratio (SNR) and contrast (CN), image nonuniformity (NU), full-width-at-half-maximum (FWHM) (i.e., blurring or geometric distortion), and ghosting ratio (GR). We found that flip angle, TE, and TR play particularly critical roles in determining image signal, homogeneity, and ghosting artifact with these sequences. Optimum clinical application of these pulse sequences requires careful attention to these imaging parameters and to their complex interactions. |
Author | Mirowitz, Scott A Li, Tao |
Author_xml | – sequence: 1 givenname: Tao surname: Li fullname: Li, Tao email: tli@umm.edu organization: Department of Diagnostic Radiology, University of Maryland Medical Center, 22 South Greene Street, Baltimore, MD 21201-1595, USA – sequence: 2 givenname: Scott A surname: Mirowitz fullname: Mirowitz, Scott A organization: Department of Radiology, University of Pittsburgh School of Medicine, 200 Lothrop Street, Pittsburgh, PA 15213-2582, USA |
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Cites_doi | 10.1007/s003300050755 10.2214/ajr.160.3.8381572 10.1148/radiology.186.3.8430191 10.1097/00004728-198807000-00006 10.2214/ajr.162.2.8310918 10.1148/radiology.183.1.1312734 10.1016/0730-725X(88)90439-0 10.1002/mrm.1910290519 10.1148/radiology.200.2.8685342 10.1148/radiology.196.1.7784584 10.2214/ajr.150.3.513 10.1016/S0730-725X(03)00173-5 10.1148/radiology.208.3.9722832 |
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10.1016/j.mri.2004.01.051_BIB4 article-title: Screening applications for MRI in the detection of upper abdominal disease publication-title: Eur Radiol doi: 10.1007/s003300050755 contributor: fullname: Jaegere – volume: 160 start-page: 501 year: 1993 ident: 10.1016/j.mri.2004.01.051_BIB8 article-title: Fast multiplanar spoiled gradient-recalled imaging of the liver publication-title: AJR Am J Roentgenol doi: 10.2214/ajr.160.3.8381572 contributor: fullname: Low – volume: 186 start-page: 803 year: 1993 ident: 10.1016/j.mri.2004.01.051_BIB11 article-title: Abdominal MR imaging publication-title: Radiology doi: 10.1148/radiology.186.3.8430191 contributor: fullname: Low – volume: 12 start-page: 575 year: 1988 ident: 10.1016/j.mri.2004.01.051_BIB5 article-title: Single breath-holding scans of the abdomen using FISP and FLASH at 1.5 T publication-title: J Comput Assist Tomogr doi: 10.1097/00004728-198807000-00006 contributor: fullname: Unger – volume: 162 start-page: 315 year: 1994 ident: 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sequence parameters in fast MR imaging of the brain with FLASH publication-title: Am J Neuroradiol contributor: fullname: Stadnik – volume: 200 start-page: 459 year: 1996 ident: 10.1016/j.mri.2004.01.051_BIB3 article-title: Liver masses publication-title: Radiology doi: 10.1148/radiology.200.2.8685342 contributor: fullname: Gaa – volume: 196 start-page: 33 year: 1995 ident: 10.1016/j.mri.2004.01.051_BIB13 article-title: Glenoid labrum publication-title: Radiology doi: 10.1148/radiology.196.1.7784584 contributor: fullname: Loredo – volume: 11 start-page: 59 year: 1990 ident: 10.1016/j.mri.2004.01.051_BIB6 article-title: The value of fast gradient-echo MR sequences in the evaluation of brain disease publication-title: AJNR Am J Neuroradiol contributor: fullname: Steinberg – volume: 150 start-page: 513 year: 1988 ident: 10.1016/j.mri.2004.01.051_BIB2 article-title: Overcoming motion in abdominal MR imaging publication-title: AJR Am J Roentgenol doi: 10.2214/ajr.150.3.513 contributor: fullname: Wood – volume: 21 start-page: 745 year: 2003 ident: 10.1016/j.mri.2004.01.051_BIB10 article-title: Fast T2-weighted MR imaging publication-title: Magn Reson Imaging doi: 10.1016/S0730-725X(03)00173-5 contributor: fullname: Li – volume: 208 start-page: 577 year: 1998 ident: 10.1016/j.mri.2004.01.051_BIB1 article-title: Diagnostic pitfalls and artifacts in abdominal MR imaging publication-title: Radiology doi: 10.1148/radiology.208.3.9722832 contributor: fullname: Mirowitz |
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