open access

Vol 51, No 5 (2017)
Review article
Submitted: 2017-02-22
Get Citation

Ultra high field TOF-MRA: A method to visualize small cerebral vessels. 7T TOF-MRA sequence parameters on different MRI scanners – Literature review

Cezary Grochowski, Grzegorz Staśkiewicz
DOI: 10.1016/j.pjnns.2017.06.011
·
Neurol Neurochir Pol 2017;51(5):411-418.

open access

Vol 51, No 5 (2017)
Review article
Submitted: 2017-02-22

Abstract

Introduction

Time-of-flight (TOF) angiography is a technique allowing to visualize the blood flow in vessels. 7T ToF-MRA is able to visualize the whole Circle of Willis including small perforating branches without any known side effects as opposed to usually used DSA and CTA with high exposition to the radiation and high doses of contrast as far as CTA is concerned.

Aim

The aim of this review is to describe ultra-high field ToF-MRA and present different protocol data depending on the scanner used in the study.

Materials and methods

PubMed, Embase, Ovid, Google Scholar databases were searched. Selection of studies for this systematic review included 7T magnetic resonance angiography studies. We searched for type of head coil used in various studies, flip angle, echo time, repetition time, field-of-view (FOV), number of slices per slab, matrix, voxel size and acquisition time.

Discussion

Visualization for the small perforating vessels of the Circle of Willis, that are not fully visualized using low-field-strength MRA is improving with increasing magnetic field strength, which has been proved by several studies.

Conclusion

Ultra-high filed ToF-MRA has found to be a superior method in depicting cerebral microvasculature. 7T ToF-MRA seems to be a reliable method for visualization of arteries up to the second order cerebral arteries and has a potential to replace DSA.

Abstract

Introduction

Time-of-flight (TOF) angiography is a technique allowing to visualize the blood flow in vessels. 7T ToF-MRA is able to visualize the whole Circle of Willis including small perforating branches without any known side effects as opposed to usually used DSA and CTA with high exposition to the radiation and high doses of contrast as far as CTA is concerned.

Aim

The aim of this review is to describe ultra-high field ToF-MRA and present different protocol data depending on the scanner used in the study.

Materials and methods

PubMed, Embase, Ovid, Google Scholar databases were searched. Selection of studies for this systematic review included 7T magnetic resonance angiography studies. We searched for type of head coil used in various studies, flip angle, echo time, repetition time, field-of-view (FOV), number of slices per slab, matrix, voxel size and acquisition time.

Discussion

Visualization for the small perforating vessels of the Circle of Willis, that are not fully visualized using low-field-strength MRA is improving with increasing magnetic field strength, which has been proved by several studies.

Conclusion

Ultra-high filed ToF-MRA has found to be a superior method in depicting cerebral microvasculature. 7T ToF-MRA seems to be a reliable method for visualization of arteries up to the second order cerebral arteries and has a potential to replace DSA.

Get Citation

Keywords

7T MRI, Ultra high field magnetic resonance, MRA, Magnetic resonance angiography, Cerebral small vessels

About this article
Title

Ultra high field TOF-MRA: A method to visualize small cerebral vessels. 7T TOF-MRA sequence parameters on different MRI scanners – Literature review

Journal

Neurologia i Neurochirurgia Polska

Issue

Vol 51, No 5 (2017)

Pages

411-418

DOI

10.1016/j.pjnns.2017.06.011

Bibliographic record

Neurol Neurochir Pol 2017;51(5):411-418.

Keywords

7T MRI
Ultra high field magnetic resonance
MRA
Magnetic resonance angiography
Cerebral small vessels

Authors

Cezary Grochowski
Grzegorz Staśkiewicz

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: viamedica@viamedica.pl