PROPELLER MRI: Clinical testing of a novel technique for quantification and compensation of head motion

Forbes, Kirsten; Pipe, James G.; Bird, C R; Heiserman, Joseph E.

doi:10.1002/jmri.1176

Cited by 139 publications

(105 citation statements)

References 9 publications

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“…Each blade consists of L lowest phase encoding lines (i.e., echo train length [ETL]) of a conventional rectilinear k-space trajectory that are acquired after a single radiofrequency excitation. The BLADE MR image in the brain has been reported to reduce motion artifacts and improve image quality (7)(8)(9)(10). Recently, the BLADE technique was also used for examinations of the upper abdomen (11,12).…”

Section: In the Upper Abdominal Region Motion Gives Rise To Various mentioning

confidence: 99%

Evaluation of motion correction effect and image quality with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) (BLADE) and parallel imaging acquisition technique in the upper abdomen

Hirokawa

Isoda

Maetani

et al. 2008

Magnetic Resonance Imaging

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Purpose:To evaluate motion correction effect and image quality in the upper abdomen with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) (BLADE) and parallel imaging acquisition technique. Materials and Methods:A total of 50 consecutive patients underwent abdominal MR imaging. Fat-saturated T2-weighted turbo spin-echo sequences were obtained by respiratory triggering. The subjects were examined with three different conditions of echo train length (ETL), blade width, and percent k-space coverage in the same scanning time: 19/30/100%, 30/30/100%, and 30/52/175%, which were designated as L/C(1), L/C(2), and L/C(3), respectively. The parallel imaging acquisition technique was used to either reduce ETL from 30 to 19 in L/C(1) or increase k-space coverage from 100% to 175% in L/C(3) compared with L/C(2). Motion and streak artifacts, and overall image quality were evaluated visually by two radiologists, independently.Results: Motion and streak artifacts were mostly reduced in L/C(3) condition. The L/C(3) image also gave the best overall image quality compared with other conditions (P Ͻ 0.001). The inter-rater reliability for each evaluation agreed well. Conclusion:In upper abdominal BLADE MRI, it was possible to reduce image artifacts and obtain better image quality by increasing the k-space coverage with parallel imaging in the same scanning time.

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Section: In the Upper Abdominal Region Motion Gives Rise To Various mentioning

confidence: 99%

Evaluation of motion correction effect and image quality with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) (BLADE) and parallel imaging acquisition technique in the upper abdomen

Hirokawa

Isoda

Maetani

et al. 2008

Magnetic Resonance Imaging

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“…Equations (3) and (4) were used to generate synthetic maps of R 1 and MT respectively using the mean relaxometry model coefficients reported in reference 11. The success of motion artefact removal was evaluated by expert raters ( n = 5, experienced physicists from WTCN), given that such evaluation has been shown to be a robust means of assessing motion artefact correction 24, 25, 26. Each rater was presented with the original map and the corresponding synthetic map and had to decide which image had the least motion artefact, i.e.…”

Section: Methodsmentioning

confidence: 99%

Synthetic quantitative MRI through relaxometry modelling

2016

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Quantitative MRI (qMRI) provides standardized measures of specific physical parameters that are sensitive to the underlying tissue microstructure and are a first step towards achieving maps of biologically relevant metrics through in vivo histology using MRI. Recently proposed models have described the interdependence of qMRI parameters. Combining such models with the concept of image synthesis points towards a novel approach to synthetic qMRI, in which maps of fundamentally different physical properties are constructed through the use of biophysical models. In this study, the utility of synthetic qMRI is investigated within the context of a recently proposed linear relaxometry model. Two neuroimaging applications are considered. In the first, artefact‐free quantitative maps are synthesized from motion‐corrupted data by exploiting the over‐determined nature of the relaxometry model and the fact that the artefact is inconsistent across the data. In the second application, a map of magnetization transfer (MT) saturation is synthesized without the need to acquire an MT‐weighted volume, which directly leads to a reduction in the specific absorption rate of the acquisition. This feature would be particularly important for ultra‐high field applications. The synthetic MT map is shown to provide improved segmentation of deep grey matter structures, relative to segmentation using T 1‐weighted images or R 1 maps. The proposed approach of synthetic qMRI shows promise for maximizing the extraction of high quality information related to tissue microstructure from qMRI protocols and furthering our understanding of the interrelation of these qMRI parameters.

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“…Another experiment included 40 subjects [17]. Volunteers were examined lying still and performing two separate head movements to assess detection and compensation of in-plane motion during MRI.…”

Section: Overview Of Literature Survey On Head and Body Motion Effectmentioning

confidence: 99%

Evaluation of the Range of Head Movements in Measurements and Recordings with Human Subjects using Head-Tracking Sensors

Wersényi

Wilson

2015

Acta Tech Jaur

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Measurements for spatial hearing research, binaural recordings, virtual reality techniques etc. often rely on Head-Related Transfer Functions of human subjects and head-tracking techniques. Individually measured HRTFs and recordings on human heads may result in more accurate localization and sound field rendering. On the other hand, the measurement and recording procedure raise new problems such as decreased signal-tonoise ratio or subject comfort. For measurements with human subjects lots of methods are used from free heads to different head fixation methods. In this paper, we report an experiment that was conducted using commercially available sensors with the goal of characterizing the range of subject head movements in various postures under various circumstances. The study analyses the range of unwanted head movements during measurements using two sensors, 3-min sessions and four body positions based on the circular angle variance, errors in yawpitch-roll directions and magnitude of standard deviation. Results of 16 participants show errors about 2 degrees and magnitudes of standard deviation of 2-8 cm depending on the situation as well as a preference for sitting instead of standing posture.

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PROPELLER MRI: Clinical testing of a novel technique for quantification and compensation of head motion

Cited by 139 publications

References 9 publications

Evaluation of motion correction effect and image quality with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) (BLADE) and parallel imaging acquisition technique in the upper abdomen

Evaluation of motion correction effect and image quality with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) (BLADE) and parallel imaging acquisition technique in the upper abdomen

Synthetic quantitative MRI through relaxometry modelling

Evaluation of the Range of Head Movements in Measurements and Recordings with Human Subjects using Head-Tracking Sensors

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