Eric Y Pierre1, David Grodzki, Gunhild Aandal, Bjoern Heismann, Chaitra Badve, Vikas Gulani, Jeffrey L Sunshine, Mark Schluchter, Kecheng Liu, Mark A Griswold. 1. From the *Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH; †Siemens AG, Erlangen, Germany; ‡Department of Radiology, University Hospitals of Cleveland, Case Western Reserve University, Cleveland, OH; §Haraldsplass Deaconess Hospital, Bergen, Norway; ∥Division of Biostatistics, Case Western Reserve University, Cleveland, OH; and ¶Siemens Medical Solutions USA Inc, Malvern, PA.
Abstract
OBJECTIVES: The objective of this study was to demonstrate the feasibility of improving perceived acoustic comfort for a standard clinical magnetic resonance imaging protocol via gradient wave form optimization and validate parallel imaging as a means to achieve a further reduction of acoustic noise. MATERIALS AND METHODS: The gradient wave forms of a standard T2 axial turbo spin-echo (TSE) sequence in head examinations were modified for acoustic performance while attempting to keep the total acquisition and inter-echo spacing the same. Parallel imaging was then used to double the inter-echo spacing and allow further wave form optimization. Along with comparative acoustic noise measurements, a statistical analysis of radiologist scoring was conducted on volumes from standard and modified sequences acquired from 10 patients after informed consent was obtained. RESULTS: Compared with TSE, significant improvement of acoustic comfort was measured for modified-sequences quiet TSE and quiet TSE with generalized autocalibrating partially parallel acquisitions (P = 0.0034 and P = 0.0003, respectively), and no statistically significant difference in diagnostic quality was observed without the use of parallel imaging. CONCLUSIONS: Standard clinical magnetic resonance imaging protocols can be made quieter through adequate gradient wave form optimization. In scans with high signal-to-noise ratio, parallel imaging can be used to further reduce acoustic noise.
OBJECTIVES: The objective of this study was to demonstrate the feasibility of improving perceived acoustic comfort for a standard clinical magnetic resonance imaging protocol via gradient wave form optimization and validate parallel imaging as a means to achieve a further reduction of acoustic noise. MATERIALS AND METHODS: The gradient wave forms of a standard T2 axial turbo spin-echo (TSE) sequence in head examinations were modified for acoustic performance while attempting to keep the total acquisition and inter-echo spacing the same. Parallel imaging was then used to double the inter-echo spacing and allow further wave form optimization. Along with comparative acoustic noise measurements, a statistical analysis of radiologist scoring was conducted on volumes from standard and modified sequences acquired from 10 patients after informed consent was obtained. RESULTS: Compared with TSE, significant improvement of acoustic comfort was measured for modified-sequences quiet TSE and quiet TSE with generalized autocalibrating partially parallel acquisitions (P = 0.0034 and P = 0.0003, respectively), and no statistically significant difference in diagnostic quality was observed without the use of parallel imaging. CONCLUSIONS: Standard clinical magnetic resonance imaging protocols can be made quieter through adequate gradient wave form optimization. In scans with high signal-to-noise ratio, parallel imaging can be used to further reduce acoustic noise.
Authors: Dan Ma; Eric Y Pierre; Yun Jiang; Mark D Schluchter; Kawin Setsompop; Vikas Gulani; Mark A Griswold Journal: Magn Reson Med Date: 2015-07-16 Impact factor: 4.668
Authors: Sebastian Fischer; David M Grodzki; Markus Domschke; Moritz Albrecht; Boris Bodelle; Katrin Eichler; Renate Hammerstingl; Thomas J Vogl; Stephan Zangos Journal: Radiol Med Date: 2016-11-28 Impact factor: 3.469
Authors: Jana Hutter; Anthony N Price; Lucilio Cordero-Grande; Shaihan Malik; Giulio Ferrazzi; Andreia Gaspar; Emer J Hughes; Daan Christiaens; Laura McCabe; Torben Schneider; Mary A Rutherford; Joseph V Hajnal Journal: Magn Reson Med Date: 2017-06-26 Impact factor: 4.668