Comparison of Maximum Signal Intensity of Contrast Agent on T1-Weighted Images Using Spin Echo, Fast Spin Echo and Inversion Recovery Sequences


Mahmood Nazarpoor 1 , * , Masoud Poureisa 2 , Mohammad Hossein Daghighi 2

1 Department of Radiology, Faculty of Paramedicine, Tabriz University of Medical Sciences,, Iran

2 Department of Radiology, Faculty of Medicine, Tabriz University of Medical Sciences, Iran

How to Cite: Nazarpoor M, Poureisa M, Daghighi M H. Comparison of Maximum Signal Intensity of Contrast Agent on T1-Weighted Images Using Spin Echo, Fast Spin Echo and Inversion Recovery Sequences, Iran J Radiol. Online ahead of Print ; 10(1):27-32. doi: 10.5812/iranjradiol.5452.


Iranian Journal of Radiology: 10 (1); 27-32
Published Online: December 27, 2012
Article Type: Research Article
Received: May 5, 2012
Accepted: October 25, 2012

Background: MRI is not able to directly measure the concentration of contrast agent. It is measured indirectly from the signal intensity (SI). It is very important to know how much contrast agent should be injected to receive a maximum SI in the region of interest (ROI).

Objectives: The aim of this study was to investigate the maximum relationship between contrast concentration and signal intensity (SI) on T1-weighted images using spin echo (SE), fast spin echo (FSE) and inversion recovery (IR) sequences.

Materials and Methods: To assess the relationship between SI and concentration, a water-filled phantom containing vials of different concentrations of gadolinium DTPA (Gd-DTPA) (0 to 19.77 mmol/L) or a constant concentration (1.2 mmol/L) of contrast agent was used. The vials of constant concentration were used to measure coil nonuniformity. The mean SI was obtained in the ROI using T1-weighted images. All studies were carried out using a 0.3 T clinical MR scanner with a standard head coil.

Results: This study shows that maximum SI will appear at different ranges in different sequences. The maximum SI can be seen at concentrations of 5.95, 4.96 and 3.98mmol/L for SE, FSE and IR, respectively.

Conclusion: Using standard imaging parameters, each MRI sequence reaches its maximum SI in a specific contrast concentration, which is highest in SE and least in IR in a comparison between SE, FSE and IR sequences.


Magnetic Resonance Imaging Relaxation Gadolinium DTPA

© 2012, Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License ( which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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