Single-shot half-Fourier RARE sequence with ultra short inter-echo spacing for lung imaging

Yoshiharu Ohno, Koichi Oshio, Hidemasa Uematsu, Masashi Nakatsu, Warren B. Gefter, Hiroto Hatabu

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Purpose: To improve the image quality of pulmonary magnetic resonance (MR) imaging using an ultra-short interecho spacing half-Fourier single shot rapid acquisition with relaxation enhancement (USHA-RARE) sequence. Materials and Methods: Pulmonary MR images were acquired by USHA-RARE sequence with various inter-echo spacings. The sequence parameters were as follows: repetition time (TR)/effective TE: infinite/39-41 msec; section thickness: 10 mm; acquisition matrix: 128 × 128; field of view: 450 × 450 mm. Inter-echo spacing varied (2.5 msec, 3.0 msec, 3.5 msec, 4.0 msec, 4.5 msec, 5.0 msec), and the respective phase-encoding steps were 80, 77, 75, 74, 73, and 72. Signal-to-noise ratios (SNRs), the signal ratios between lung and fat (lung-to-fat ratio: LFRs), and the signal ratios between the lung and the serratus anterior muscle (lung-to-muscle ratio: LMRs) of each inter-echo spacing were calculated, and statistically evaluated. Results: The SNRs at inter-echo spacings of ≤ 3.0 msec were significantly higher than those ≥ 4.0 msec (P < 0.05). The LFRs and LMRs at inter-echo spacing ≤ 3.0 msec were significantly higher than those ≥ 4.0 msec (P < 0.05). Conclusion: USHA-RARE sequence does improve signal intensity from the lung.

Original languageEnglish
Pages (from-to)336-339
Number of pages4
JournalJournal of Magnetic Resonance Imaging
Volume20
Issue number2
DOIs
Publication statusPublished - 2004 Aug
Externally publishedYes

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Lung
Signal-To-Noise Ratio
Fats
Muscles
Magnetic Resonance Spectroscopy
Magnetic Resonance Imaging

Keywords

  • Half-Fourier imaging
  • Lung
  • Magnetic resonance (MR)
  • Pulse sequence
  • Rapid imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Single-shot half-Fourier RARE sequence with ultra short inter-echo spacing for lung imaging. / Ohno, Yoshiharu; Oshio, Koichi; Uematsu, Hidemasa; Nakatsu, Masashi; Gefter, Warren B.; Hatabu, Hiroto.

In: Journal of Magnetic Resonance Imaging, Vol. 20, No. 2, 08.2004, p. 336-339.

Research output: Contribution to journalArticle

Ohno, Yoshiharu ; Oshio, Koichi ; Uematsu, Hidemasa ; Nakatsu, Masashi ; Gefter, Warren B. ; Hatabu, Hiroto. / Single-shot half-Fourier RARE sequence with ultra short inter-echo spacing for lung imaging. In: Journal of Magnetic Resonance Imaging. 2004 ; Vol. 20, No. 2. pp. 336-339.
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N2 - Purpose: To improve the image quality of pulmonary magnetic resonance (MR) imaging using an ultra-short interecho spacing half-Fourier single shot rapid acquisition with relaxation enhancement (USHA-RARE) sequence. Materials and Methods: Pulmonary MR images were acquired by USHA-RARE sequence with various inter-echo spacings. The sequence parameters were as follows: repetition time (TR)/effective TE: infinite/39-41 msec; section thickness: 10 mm; acquisition matrix: 128 × 128; field of view: 450 × 450 mm. Inter-echo spacing varied (2.5 msec, 3.0 msec, 3.5 msec, 4.0 msec, 4.5 msec, 5.0 msec), and the respective phase-encoding steps were 80, 77, 75, 74, 73, and 72. Signal-to-noise ratios (SNRs), the signal ratios between lung and fat (lung-to-fat ratio: LFRs), and the signal ratios between the lung and the serratus anterior muscle (lung-to-muscle ratio: LMRs) of each inter-echo spacing were calculated, and statistically evaluated. Results: The SNRs at inter-echo spacings of ≤ 3.0 msec were significantly higher than those ≥ 4.0 msec (P < 0.05). The LFRs and LMRs at inter-echo spacing ≤ 3.0 msec were significantly higher than those ≥ 4.0 msec (P < 0.05). Conclusion: USHA-RARE sequence does improve signal intensity from the lung.

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