Purpose: To use a volume-selective 3D turbo spin echo (TSE) technique to image the carotid artery wall and measure distensibility.
Materials And Methods: A high-resolution volume-selective 3D TSE sequence has been developed. Volume selection is accomplished by orthogonal gradients for the 90 degrees and 180 degrees excitations and allows a 3D volume of vessel wall to be imaged in a relatively short time. The technique has been developed to allow imaging at any defined phase of the cardiac cycle so that the vascular function and distensibility can be studied.
Results: Scan efficiency is increased by the reduced phase encode field of view (FOV) (k(y) steps) by the use of selective volume excitation. Significantly more slices (k(z) phase encode steps) for vessel coverage can be acquired with the same scan time as that of the conventional sequence while maintaining signal-to-noise ratio (SNR) levels. The practical value of the technique was demonstrated on 10 normal subjects with high-resolution vessel distensibility measurements of the carotid arteries.
Conclusion: A volume-selective TSE method has been used for carotid artery wall imaging and measurement of distensibility in normal subjects. Larger coverage of the vessel, and therefore more information for clinical diagnostics, was achieved with the same overall scan time with an SNR comparable to that of 2D full FOV images.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/jmri.10294 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Intravascular ultrasound correlation of unenhanced magnetic resonance venography in the context of pelvic deep venous disease.
J Vasc Surg Venous Lymphat Disord
September 2022
Department of Diagnostic Radiology, Tan Tock Seng Hospital, Singapore. Electronic address:
Objective: In the present retrospective, assessor-blinded cross-sectional study, we compared the diagnostic efficacy of the relaxation-enhanced angiography without contrast and triggering (REACT) protocol for magnetic resonance venography (MRV) and intravascular ultrasound (IVUS).
Methods: All patients without prior lower limb vascular stenting who had undergone MRV with the REACT protocol and IVUS at our institution from January 2018 to May 2020 were included. The REACT protocol for MRV comprises three main phases: the adiabatic-based T2-preparation module, the non-volume-selective short tau inversion recovery pulse sequence, and the three-dimensional, modified two-point chemical-shift water-fat separated turbo-field echo pulse sequence.
Novel technique used to detect swallowing in volume-selective turbo spin-echo (TSE) for carotid artery wall imaging.
J Magn Reson Imaging
January 2009
Cardiovascular Magnetic Resonance Unit, Royal Brompton Hospital, London, UK.
Article Synopsis
- The study aimed to enhance the quality of 3D carotid wall imaging by integrating a new swallowing detection device that tracks motion during scanning.
- A carbon-fiber device was placed over the throat to detect swallowing movements, and an algorithm was used to filter out data collected during these movements to reduce image artifacts.
- Results showed that scans processed with the algorithm scored significantly higher in image quality compared to those without it, indicating that the device successfully improved the clarity of the vascular images during 3D acquisitions.
Elimination of residual blood flow-related signal in 3D volume-selective TSE arterial wall imaging using velocity-sensitive phase reconstruction.
J Magn Reson Imaging
March 2006
Magnetic Resonance Unit, Imperial College and Royal Brompton Hospital, Royal Brompton and Harefield NHS Trust, Sydney Street, London SW3 6NP, UK.
Purpose: To improve 3D volume-selective turbo spin-echo (TSE) arterial wall imaging by introducing velocity phase sensitivity to the sequence.
Materials And Methods: Slow or recirculating blood may give incomplete nulling in 3D vessel wall imaging, hindering differentiation between arterial wall and lumen. Reconstructed phase images are used to reduce the residual blood signal with postprocessing.
An evaluation of the TSE MR sequence for time efficient data acquisition in polymer gel dosimetry of applications involving high doses and steep dose gradients.
Med Phys
November 2005
Philips Hellas Medical Systems, 44 Kifissias Ave., Maroussi 151 25, Athens, Greece.
The use of magnetic resonance imaging as a readout method for polymer gel dosimetry commonly involves long imaging sessions, particularly when high spatial resolution is required in all three dimensions, for the investigation of dose distributions with steep dose gradients and stringent dose delivery specifications. In this work, a volume selective turbo spin echo (TSE) pulse sequence is compared to the established Carr-Purcell-Meiboom-Gill (CPMG) multiecho acquisition with regard to providing accurate dosimetric results in significantly reduced imaging times. Polyethylene glycol diacrylate based (PABIG) gels were irradiated and subsequently scanned to obtain R2 relaxation rate measurements, using a CPMG multiecho sequence and a dual echo TSE utilizing an acceleration (turbo) factor of 64.
View Article and Find Full Text PDF3D volume-selective turbo spin echo for carotid artery wall imaging with navigator detection of swallowing.
J Magn Reson Imaging
October 2005
Magnetic Resonance Unit, Imperial College and Royal Brompton Hospital, London, UK.
Purpose: To improve 3D volume-selective turbo spin echo (TSE) carotid artery wall imaging by incorporating navigators to reduce artifacts caused by swallowing.
Materials And Methods: Images were acquired on a Siemens Magnetom Sonata 1.5T scanner.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!