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High SNR flexible top hat monopole probe for 1.5 T MRI
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High SNR flexible top hat monopole probe for 1.5 T MRI
M Mohammadzadeh et al 2006 Meas. Sci. Technol. 17 1987-1994 doi: 10.1088/0957-0233/17/7/043
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M Mohammadzadeh1, M Shahabadi2, H Soltanian-Zadeh3,4, A Tavakoli5, B Rafiei6, D Javidnia6 and M A Oghabian7
1 Department of Physics, Amir-Kabir University of Technology, Tehran, Iran
2 School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
3 Control and Intelligent Processing Center of Excellence, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
4 Image Analysis Laboratory, Department of Radiology, Henry Ford Health System, Detroit, MI, USA
5 Department of Electrical Engineering, Amir-Kabir University of Technology, Tehran, Iran
6 Medical Imaging Center, Imam Khomeyni Hospital, Tehran, Iran
7 Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, IranAbstract.
In this paper, design principles and application of a thin and flexible intravascular top hat monopole probe with increased signal-to-noise ratio (SNR) and improved longitudinal and radial coverage are described and compared with the conventional monopole probe. The top hat probe is constructed by removing a segment of the shield of a coaxial cable. A flexible thin copper foil in contact with the inner conductor of the cable is added to the end section of the cable. The copper foil acts as an antenna top hat load increasing the uniformity of the current distribution on the probe and establishes a uniform region of SNR distribution around the probe. Improvement of the SNR distribution of the top hat probe relative to the conventional monopole probe is evaluated using quantitative indices. Experimental results show that for the top hat probe, the ratio of the maximum image SNR to its relative standard deviation (SR) is 2.73 times higher than that of a conventional probe.Keywords:
magnetic resonance imaging (MRI), intravascular imaging, top hat monopole probe, signal-to-noise ratio (SNR), field uniformity, imaging field of view (FOV)
Print publication: Issue 7 (July 2006)Received 16 January 2006, in final form 8 April 2006
Published 21 June 2006
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M MohammadzadehM ShahabadiH Soltanian-ZadehA TavakoliB RafieiD JavidniaM A Oghabian
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