Atwater Kent Laboratories, 228
- Professor, Electrical & Computer Engineering
- Co-Director, MITRE Project Center
I came to WPI over 20 years ago after graduating from Colorado State University. My research includes electromagnetic and acoustic nondestructive evaluation (NDE), and for the past 15 years instrumentation for Magnetic Resonance Imaging (MRI). As director of the RF Electronics and Medical Imaging Laboratory, I focus on designing radiofrequency (RF) coils and electronic circuits for pre-clinical (animal) and clinical (human) MR scanners. My interest is the design of application-specific RF coils and resonators to excite the nuclei inside a biological region of interest and then obtain signal responses emitted by these nuclei as they undergo reorientation in the presence of strong static and gradient magnetic fields. The needs for RF coils in MRI are highly diverse, ranging from large volume coils for full-body imaging, over single- and multi-channel head coils for cranial imaging, to array coils for neck, breast, wrist, and ankle imaging. Our most recent work has focused on multi-channel coils for bilateral female breast imaging and prostate imaging in 1.5T and 3T clinical MR scanners. The goal of our research is to increase the signal to noise performance and field uniformity of these RF coils in an effort to render high-resolution images that assist radiologists in their diagnoses.
- electromagnetic theory
- nondestructive evaluation
- ultrasonic wave modeling
- imaging techniques
- elastic field generation by lasers and EMAT transducers
- MRI coil designs
- MS, University of Wuppertal, 1983
- PhD, Colorado State University, 1986
- Serano P, Ludwig R, “A Reconfigurable Tuning and Detuning Circuit for RF Coil Configurations,” 17th annual meeting of International Society of Magnetic Resonance in Medicine, Honolulu, HI, 18 – 24 April, p. 4770, 2009.
- Ludwig R. and Bogdanov G, RF Circuit Design: Theory and Applications, 2nd edition, Prentice Hall, pp. 720, April 2008.
- Makarov S, and Ludwig R, “Analytical Model of the Split-Coaxial Balun and Its Application to a Linearly-Polarized Dipole or a CP Turnstile”, IEEE Transactions on Antennas and Propagation, Vol. 55, Issue 7, pp. 1909 – 1918, July 2007.
- Lemdiasov R, Obi A, and Ludwig R, “Time Domain Formulation of the Method of Moments for Inhomogeneous Conductive Bodies at Low Frequencies,” IEEE Transactions on Antennas and Propagation, Vol. 54, No. 2, pp. 706 – 714, Feb. 2006.
- Lemdiasov R., Ludwig R., “A Stream Function Method for Gradient Coil Design,” Concepts in Magnetic Resonance, Part-B Magnetic Resonance Engineering, 26B (1), pp. 67-80, Aug. 2005.
Labs and Centers
- Author: RF Circuit Design: Theory & Applications, 2/e
- Senior Member IEEE
- Best Teacher Award 1996
- Joseph S.Satin Distinguished Fellow in Electrical Engineering
- The Electromagnetics Academy