PURPOSE: To demonstrate that the time delay between phase and frequency encoding and the presence of pulsatile blood flow in high-resolution time-of-flight (TOF) imaging of the intracranial arteries (especially near the circle of Willis) can distort the appearance of blood vessels and result in a cross-hatch-appearing artifact in surrounding tissue. MATERIALS AND METHODS: Two techniques to reduce the artifact, tri-directional flow compensation (3DFC) and elliptical-centric (EC) phase-encoding order, are investigated in five volunteer studies. RESULTS: 3DFC eliminates the pulsation-related artifacts and the vessel distortion. A residual amplitude variation artifact is observed. EC phase encoding nearly eliminates the pulsatile motion-related artifact, but it does not eliminate vessel distortion. CONCLUSION: The combination of 3DFC and EC phase encoding appears to provide the greatest artifact reduction in the five volunteer studies performed. Copyright 2003 Wiley-Liss, Inc.
PURPOSE: To demonstrate that the time delay between phase and frequency encoding and the presence of pulsatile blood flow in high-resolution time-of-flight (TOF) imaging of the intracranial arteries (especially near the circle of Willis) can distort the appearance of blood vessels and result in a cross-hatch-appearing artifact in surrounding tissue. MATERIALS AND METHODS: Two techniques to reduce the artifact, tri-directional flow compensation (3DFC) and elliptical-centric (EC) phase-encoding order, are investigated in five volunteer studies. RESULTS: 3DFC eliminates the pulsation-related artifacts and the vessel distortion. A residual amplitude variation artifact is observed. EC phase encoding nearly eliminates the pulsatile motion-related artifact, but it does not eliminate vessel distortion. CONCLUSION: The combination of 3DFC and EC phase encoding appears to provide the greatest artifact reduction in the five volunteer studies performed. Copyright 2003 Wiley-Liss, Inc.
Authors: James M Farnham; Nicola J Camp; Susan L Neuhausen; Jay Tsuruda; Dennis Parker; Joel MacDonald; Lisa A Cannon-Albright Journal: Hum Genet Date: 2003-11-06 Impact factor: 4.132
Authors: Karl T Diedrich; John A Roberts; Richard H Schmidt; Chang-Ki Kang; Zang-Hee Cho; Dennis L Parker Journal: BMC Bioinformatics Date: 2011-10-18 Impact factor: 3.169
Authors: Saskia Bollmann; Hendrik Mattern; Michaël Bernier; Simon D Robinson; Daniel Park; Oliver Speck; Jonathan R Polimeni Journal: Elife Date: 2022-04-29 Impact factor: 8.713