Extending slice coverage for breathhold fat-suppressed T2-weighted fast spin-echo of the liver at 3.0T: Application of Variable-Rate Selective-Excitation (VERSE) RF pulses

Indra C. Van Den Bos, Shahid M. Hussain, Gabriel P. Krestin, Piotr A. Wielopolski

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Purpose: To determine the benefits of variable-rate selective-excitation (VERSE) radio frequency (RF) pulses for increased slice coverage in breathhold (BH) fat-suppressed T2-weighted fast spin-echo (FS-T2W-FSE) liver imaging at 3.0T. Materials and Methods: A total of 12 healthy volunteers were imaged on 3.0T, using FS-T2W-FSE. Slice coverage and specific absorption rate (SAR) levels were monitored for VERSE-RF and standard-RF (sRF), respectively. BH time was 25 seconds; slice thickness 3.5 mm. Maximum coverage was recorded for interactive variation of repetition time (TR), bandwidth (BW), and echo-train length (ETL). Image quality was assessed qualitatively and quantitatively. Results: Total slice coverage was always higher using VERSE-RF, but varied depending on the selected parameters. For BW ≥ 62.5 kHz, slice coverage using VERSE increased between 38% (TR = 8200 msec) and 58% (TR = 2500 msec). Maximum coverage was obtained for TR = 5000 msec, ETL = 12, and BW ≥ 62.5 kHz; with a mean of 31.8 slices for VERSE-RF and 22.5 slices for sRF, respectively (P < 0.005, 41% increased coverage). SAR was lower for VERSE-RF using BW < 41.67 kHz (P < 0.05), and equal to sRF for higher BW. Image quality was best for TR ≤ 5000 msec (P < 0.05). FS was more homogeneous for lower ETL (P < 0.05). Blood suppression was best for TR ≤ 5000 msec (P < 0.05). Conclusion: VERSE-RF pulses can be applied for thin-slice BH FS-T2W liver imaging at 3.0T, with significantly improved slice coverage.

Original languageEnglish (US)
Pages (from-to)110-116
Number of pages7
JournalJournal of Magnetic Resonance Imaging
Volume27
Issue number1
DOIs
StatePublished - Jan 1 2008

Fingerprint

Radio
Fats
Liver
Healthy Volunteers
Magnetic Resonance Imaging

Keywords

  • 3.0 Tesla
  • Liver
  • MR imaging
  • Slice coverage
  • Specific absorption rate
  • VERSE

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Extending slice coverage for breathhold fat-suppressed T2-weighted fast spin-echo of the liver at 3.0T : Application of Variable-Rate Selective-Excitation (VERSE) RF pulses. / Van Den Bos, Indra C.; Hussain, Shahid M.; Krestin, Gabriel P.; Wielopolski, Piotr A.

In: Journal of Magnetic Resonance Imaging, Vol. 27, No. 1, 01.01.2008, p. 110-116.

Research output: Contribution to journalArticle

@article{0562c4e3d47b48c2b19948fb6b8d636d,
title = "Extending slice coverage for breathhold fat-suppressed T2-weighted fast spin-echo of the liver at 3.0T: Application of Variable-Rate Selective-Excitation (VERSE) RF pulses",
abstract = "Purpose: To determine the benefits of variable-rate selective-excitation (VERSE) radio frequency (RF) pulses for increased slice coverage in breathhold (BH) fat-suppressed T2-weighted fast spin-echo (FS-T2W-FSE) liver imaging at 3.0T. Materials and Methods: A total of 12 healthy volunteers were imaged on 3.0T, using FS-T2W-FSE. Slice coverage and specific absorption rate (SAR) levels were monitored for VERSE-RF and standard-RF (sRF), respectively. BH time was 25 seconds; slice thickness 3.5 mm. Maximum coverage was recorded for interactive variation of repetition time (TR), bandwidth (BW), and echo-train length (ETL). Image quality was assessed qualitatively and quantitatively. Results: Total slice coverage was always higher using VERSE-RF, but varied depending on the selected parameters. For BW ≥ 62.5 kHz, slice coverage using VERSE increased between 38{\%} (TR = 8200 msec) and 58{\%} (TR = 2500 msec). Maximum coverage was obtained for TR = 5000 msec, ETL = 12, and BW ≥ 62.5 kHz; with a mean of 31.8 slices for VERSE-RF and 22.5 slices for sRF, respectively (P < 0.005, 41{\%} increased coverage). SAR was lower for VERSE-RF using BW < 41.67 kHz (P < 0.05), and equal to sRF for higher BW. Image quality was best for TR ≤ 5000 msec (P < 0.05). FS was more homogeneous for lower ETL (P < 0.05). Blood suppression was best for TR ≤ 5000 msec (P < 0.05). Conclusion: VERSE-RF pulses can be applied for thin-slice BH FS-T2W liver imaging at 3.0T, with significantly improved slice coverage.",
keywords = "3.0 Tesla, Liver, MR imaging, Slice coverage, Specific absorption rate, VERSE",
author = "{Van Den Bos}, {Indra C.} and Hussain, {Shahid M.} and Krestin, {Gabriel P.} and Wielopolski, {Piotr A.}",
year = "2008",
month = "1",
day = "1",
doi = "10.1002/jmri.21215",
language = "English (US)",
volume = "27",
pages = "110--116",
journal = "Journal of Magnetic Resonance Imaging",
issn = "1053-1807",
publisher = "John Wiley and Sons Inc.",
number = "1",

}

TY - JOUR

T1 - Extending slice coverage for breathhold fat-suppressed T2-weighted fast spin-echo of the liver at 3.0T

T2 - Application of Variable-Rate Selective-Excitation (VERSE) RF pulses

AU - Van Den Bos, Indra C.

AU - Hussain, Shahid M.

AU - Krestin, Gabriel P.

AU - Wielopolski, Piotr A.

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Purpose: To determine the benefits of variable-rate selective-excitation (VERSE) radio frequency (RF) pulses for increased slice coverage in breathhold (BH) fat-suppressed T2-weighted fast spin-echo (FS-T2W-FSE) liver imaging at 3.0T. Materials and Methods: A total of 12 healthy volunteers were imaged on 3.0T, using FS-T2W-FSE. Slice coverage and specific absorption rate (SAR) levels were monitored for VERSE-RF and standard-RF (sRF), respectively. BH time was 25 seconds; slice thickness 3.5 mm. Maximum coverage was recorded for interactive variation of repetition time (TR), bandwidth (BW), and echo-train length (ETL). Image quality was assessed qualitatively and quantitatively. Results: Total slice coverage was always higher using VERSE-RF, but varied depending on the selected parameters. For BW ≥ 62.5 kHz, slice coverage using VERSE increased between 38% (TR = 8200 msec) and 58% (TR = 2500 msec). Maximum coverage was obtained for TR = 5000 msec, ETL = 12, and BW ≥ 62.5 kHz; with a mean of 31.8 slices for VERSE-RF and 22.5 slices for sRF, respectively (P < 0.005, 41% increased coverage). SAR was lower for VERSE-RF using BW < 41.67 kHz (P < 0.05), and equal to sRF for higher BW. Image quality was best for TR ≤ 5000 msec (P < 0.05). FS was more homogeneous for lower ETL (P < 0.05). Blood suppression was best for TR ≤ 5000 msec (P < 0.05). Conclusion: VERSE-RF pulses can be applied for thin-slice BH FS-T2W liver imaging at 3.0T, with significantly improved slice coverage.

AB - Purpose: To determine the benefits of variable-rate selective-excitation (VERSE) radio frequency (RF) pulses for increased slice coverage in breathhold (BH) fat-suppressed T2-weighted fast spin-echo (FS-T2W-FSE) liver imaging at 3.0T. Materials and Methods: A total of 12 healthy volunteers were imaged on 3.0T, using FS-T2W-FSE. Slice coverage and specific absorption rate (SAR) levels were monitored for VERSE-RF and standard-RF (sRF), respectively. BH time was 25 seconds; slice thickness 3.5 mm. Maximum coverage was recorded for interactive variation of repetition time (TR), bandwidth (BW), and echo-train length (ETL). Image quality was assessed qualitatively and quantitatively. Results: Total slice coverage was always higher using VERSE-RF, but varied depending on the selected parameters. For BW ≥ 62.5 kHz, slice coverage using VERSE increased between 38% (TR = 8200 msec) and 58% (TR = 2500 msec). Maximum coverage was obtained for TR = 5000 msec, ETL = 12, and BW ≥ 62.5 kHz; with a mean of 31.8 slices for VERSE-RF and 22.5 slices for sRF, respectively (P < 0.005, 41% increased coverage). SAR was lower for VERSE-RF using BW < 41.67 kHz (P < 0.05), and equal to sRF for higher BW. Image quality was best for TR ≤ 5000 msec (P < 0.05). FS was more homogeneous for lower ETL (P < 0.05). Blood suppression was best for TR ≤ 5000 msec (P < 0.05). Conclusion: VERSE-RF pulses can be applied for thin-slice BH FS-T2W liver imaging at 3.0T, with significantly improved slice coverage.

KW - 3.0 Tesla

KW - Liver

KW - MR imaging

KW - Slice coverage

KW - Specific absorption rate

KW - VERSE

UR - http://www.scopus.com/inward/record.url?scp=37849004533&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37849004533&partnerID=8YFLogxK

U2 - 10.1002/jmri.21215

DO - 10.1002/jmri.21215

M3 - Article

C2 - 18058934

AN - SCOPUS:37849004533

VL - 27

SP - 110

EP - 116

JO - Journal of Magnetic Resonance Imaging

JF - Journal of Magnetic Resonance Imaging

SN - 1053-1807

IS - 1

ER -