Sources and correction of higher order geometrical distortion for serial MR brain imaging

M Holden; M Breeuwer; K McLeish; D J Hawkes; S F Keevil; D L Hill

Sources and correction of higher order geometrical distortion for serial MR brain imaging

M Holden, M Breeuwer, K McLeish, D J Hawkes, S F Keevil, D L Hill

King's College London

Research output: Contribution to journal › Conference paper

8 Citations (Scopus)

Abstract

A specially designed phantom consisting of a 3D array of 427 accurately manufactured spheres together with a point-based registration algorithm was used to detect distortion described by polynomial orders 1-4. More than thirty 3D gradient echo (GRE) and multi-slice spin echo (SE) phantom scans were acquired with a Philips 1.5T Gyroscan ACS2. Distortion was measured as a function of: readout gradient strength (0.72 0.93). There was a significantly higher (p <0.01) sagittal shear for 5 SE scans compared with 5 FFE ones with the same G, possibly because of slice selection. Different shim settings produced only linear distortion change: up to 2 % scale kand 1 degree shear. There was negligible distortion change over time: scale <0.1%, shear 0.9, n = 3), 75% of the distortion was either first or second order.

Original language	English
Pages (from-to)	69 - 78
Number of pages	10
Journal	PROCEEDINGS- SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING
Volume	2
Issue number	27
Publication status	Published - 2001
Event	Medical Imaging 2001 Conference - SAN DIEGO, CALIFORNIA Duration: 1 Jan 2001 → …

Cite this

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title = "Sources and correction of higher order geometrical distortion for serial MR brain imaging",

abstract = "A specially designed phantom consisting of a 3D array of 427 accurately manufactured spheres together with a point-based registration algorithm was used to detect distortion described by polynomial orders 1-4. More than thirty 3D gradient echo (GRE) and multi-slice spin echo (SE) phantom scans were acquired with a Philips 1.5T Gyroscan ACS2. Distortion was measured as a function of: readout gradient strength (0.72 0.93). There was a significantly higher (p <0.01) sagittal shear for 5 SE scans compared with 5 FFE ones with the same G, possibly because of slice selection. Different shim settings produced only linear distortion change: up to 2 % scale kand 1 degree shear. There was negligible distortion change over time: scale <0.1%, shear 0.9, n = 3), 75% of the distortion was either first or second order.",

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T1 - Sources and correction of higher order geometrical distortion for serial MR brain imaging

AU - Holden, M

AU - Breeuwer, M

AU - McLeish, K

AU - Hawkes, D J

AU - Keevil, S F

AU - Hill, D L

PY - 2001

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AB - A specially designed phantom consisting of a 3D array of 427 accurately manufactured spheres together with a point-based registration algorithm was used to detect distortion described by polynomial orders 1-4. More than thirty 3D gradient echo (GRE) and multi-slice spin echo (SE) phantom scans were acquired with a Philips 1.5T Gyroscan ACS2. Distortion was measured as a function of: readout gradient strength (0.72 0.93). There was a significantly higher (p <0.01) sagittal shear for 5 SE scans compared with 5 FFE ones with the same G, possibly because of slice selection. Different shim settings produced only linear distortion change: up to 2 % scale kand 1 degree shear. There was negligible distortion change over time: scale <0.1%, shear 0.9, n = 3), 75% of the distortion was either first or second order.

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M3 - Conference paper

VL - 2

SP - 69

EP - 78

JO - PROCEEDINGS- SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING

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T2 - Medical Imaging 2001 Conference

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Sources and correction of higher order geometrical distortion for serial MR brain imaging

Abstract

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