Reza Basiri

Research

Journal article, July 2019

Transverse relaxometry with transmit field-constrained stimulated echo compensation

Reza Basiri, Paolo Federico, Robert Marc Lebel

Magnetic Resonance Materials in Physics, Biology and Medicine (MAGMA), 32(6), 669-677. DOI 10.1007/s10334-019-00769-9

In brief

Quantitative T2 maps can reveal subtle tissue changes, but real scanners never produce the clean exponential decay the standard fit assumes. Stimulated echo correction fixes the bias at the cost of noisier estimates. This paper's two-step method uses the fact that the transmit field varies smoothly across the head, fixing it in a second pass so each voxel fits fewer free parameters.

Key findings

  • Free parameters per voxel reduced from three to two
  • More precise T2 maps with the accuracy of full stimulated echo correction
  • Reliable and reproducible quantitative maps for clinical research

Read at the publisher

Related work

  1. Focal epilepsy without interictal spikes on scalp EEG: A common finding of uncertain significance

    Reza Basiri, Aidin Shariatzadeh, Samuel Wiebe, Yahya Aghakhani

    Journal article. Epilepsy Research, 150, 1-6, 2019

    Doctors use interictal spikes on EEG to locate and classify epilepsy, but not every patient shows them. Reviewing seven years of video-EEG monitoring at the Calgary Epilepsy Program, this study measured how often adults with focal epilepsy never spike on scalp EEG and whether they differ clinically from those who do.

    SummaryPublisher

  2. Method for Optimizing Quantitative Temporal Lobe Epilepsy MR Imaging

    Reza Basiri

    MSc thesis. University of Calgary, 2018 Open access

    Standard MRI can miss the subtle hippocampal changes behind temporal lobe epilepsy. This thesis develops a leaner stimulated echo correction for T2 relaxometry and tests it on simulated and patient data, with the goal of making those lesions easier to find.

    SummaryPublisher

  3. Method for Optimizing Quantitative Temporal Lobe Epilepsy MR Imaging

    Reza Basiri, Paolo Federico, Robert Marc Lebel

    Conference abstract. Calgary Epilepsy Research Retreat, 2016

    An early report of the optimized T2 relaxometry method and its use for temporal lobe epilepsy imaging, presented to Calgary's epilepsy research community.

    Summary