Iranian Journal of Medical Physics

Iranian Journal of Medical Physics

Comparison of Pulse Sequences of Magnetic Resonance Imaging for Optimization of Timing and Image Quality

Document Type : Original Paper

Authors
Naima Amin 1
Muhammad Yousaf 2
Muhammad Arshad Javid 3
Atika Farooq 1
1 Department of Physics, COMSATS University Islamabad, Lahore Campus, Pakistan
2 Mathematics Department, COMSATS University Islamabad, Lahore Campus, Pakistan
3 Department of Basic Sciences,UET,Taxila Pakistan.
10.22038/ijmp.2019.38606.1501
Abstract
Introduction: The present study aimed to three frequently used pulse sequences of magnetic resonance imaging (MRI) to assess the image quality of theses pulse sequences at short acquisition time.
Material and Methods: For the purpose of study two tissue equivalent gels were prepared. One gel was made from Polysaccharide and Agarose, whereas second gel was obtained from Ferrous Benzoic Xylenol Orange (FBX) which is tissue equivalent material. 6MV photons were used to irradiate FBX gel from linear accelerator with 25 Gray dose. Imaging parameters are performed in repetition time (TR) for experimental variations. The quantitative analysis included contrast-to-noise ratio (CNR) and signal to noise ratio (SNR).
Results: As evidenced by obtained results at 1.5 Tesla, Fast Spin Echo (FSE) and Fast Fluid Attenuated Inversion Recovery (FLAIR) were most comparable in SNR although, acquisition time of FSE is 62%, 9 %, and 15% less than FLAIR at different values of 4000ms, 4200ms and 4600ms of TR. CNR of Conventional Spin Echo (CSE) was 143% and 93% better than FSE and FLAIR respectively. The time difference between CSE and FSE was 6 min and 34 sec while this difference was 6 min and 43 sec between CSE and FLAIR.
Conclusion: FSE and FLAIR produced optimal image quality for many tissues. Their reduced acquisition time could make them perfect option for patients who cannot tolerate longer imaging time. Nonetheless long acquisition time cannot undervalue importance of CSE since it has yielded significantly higher contrast and SNR in T2-weighted images among other pulse sequences of MRI.
Keywords
Diagnosis
Imaging
Magnetic Resonance Imaging
Phantoms
Signal to noise ratio
Subjects

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Iranian Journal of Medical Physics
Volume 17, Issue 6
November and December 2020
Pages 350-358

  • Receive Date 21 February 2019
  • Revise Date 29 June 2019
  • Accept Date 04 September 2019