Influence of biological subject, shielding cage, and resonance frequency on radio wave propagation in a birdcage coil. Issue 10 (1st May 2016)

• Record Type: Journal Article
• Authors: Seo, J.‐H.; Ryu, Y.; Han, S.‐D.; Song, H.; Kim, H.‐K.; Kim, K.‐N.
• Is Part Of: Electronics letters. Volume 52:Issue 10(2016)
• Page Start: 801
• Page End: 803
• Publication Date: 2016-05-01
• Subjects: radiowave propagation -- coils -- radio transmitters -- radio receivers -- low‐pass filters -- high‐pass filters -- band‐pass filters -- biomedical MRI -- finite difference time‐domain analysis -- biomedical communication; biological subject -- resonance frequency -- radio wave propagation -- birdcage transmit‐receive radiofrequency coil -- RF coil -- lowpass filter configuration -- highpass filter configuration -- bandpass filter configuration -- mouse body magnetic resonance imaging -- numerical analysis -- finite‐difference time‐domain method -- RF shielding cage configuration -- magnetic flux density 1.5 T -- magnetic flux density 3.0 T -- magnetic flux density 4.7 T -- magnetic flux density 7.0 T -- magnetic flux density 9.4 T -- magnetic flux density 11.7 T -- frequency 63.87 MHz -- frequency 127.74 MHz -- frequency 200 MHz -- frequency 300 MHz -- frequency 400 MHz -- frequency 500 MHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.0533
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Radio wave propagation of three types of birdcage transmit/receive radio‐frequency (RF) coils (lowpass filter, highpass filter, and bandpass filter configurations) was analysed for mouse body magnetic resonance imaging at main magnetic fields of 1.5, 3.0, 4.7, 7.0, 9.4, and 11.7 T (Larmor frequencies of 63.87, 127.74, 200, 300, 400, and 500 MHz) in terms of magnetic (| B 1 |) field sensitivity and homogeneity. The observed radio wave propagation in the central axial | B 1 | field, as influenced by the biological subject, was calculated numerically in the finite‐difference time‐domain method and compared with assessment criteria using the mean value and standard deviation. The results for different Larmor frequencies RF shielding cage configurations, and biological subject loading versus unloading were compared and are discussed in detail.