About us.
Radiation Physics Solutions (RPS) is a comprehensive radiation therapy physics and radiation safety consulting firm based in Philadelphia, PA. Founded by a team of highly qualified, board-certified medical physicists and dosimetrists, we specialize in a wide range of technologies including, but not limited to, linear accelerators, GammaKnife, CyberKnife, proton therapy, and HDR brachytherapy.
We offer a full spectrum of services, including shielding design, equipment selection, regulatory application support, commissioning, staffing, accreditation preparation, quality assurance, treatment planning, chart review, and clinical oversight.
RPS provides both long-term and short-term physics and dosimetry support—either onsite or remotely—tailored to meet the needs of radiation oncology programs. Whether you're looking for routine coverage or support for specialized projects, we offer flexible, high-quality solutions.
To date, we have partnered with dozens of hospitals and healthcare facilities across the United States. Our team has commissioned over 100 linear accelerator and stereotactic radiosurgery (SRS) programs, and we currently provide ongoing support for more than a dozen active radiation oncology centers.
We are a clinically focused team with a strong commitment to research and innovation. Our passion lies in delivering the highest quality care and services to patients.
We collaborate closely with radiation oncologists, dosimetrists, therapists, administrators, and other professionals—recognizing that outstanding patient care requires coordinated expertise across disciplines.
Our Team
President
Jun Yang, PhD, DABR
Dr. Jun Yang, founder and president of RPS, is a world renown medical physicist specialized in robotic arm stereotactic radiosurgery and stereotactic body radiation therapy. He is author of 100+ publications and serves as board of director and chair of physics committee for The Radiosurgery Society, member of AAPM task groups, and editorial board for Journal of Radiation Therapy and Journal of Applied Clinical Medical Physics.
Education
University of Miami
PhD. in Medical Physics, 2006
Beijing University of Chemical Technology
MS in Automation Engineer Technology, 2001
Research
Activities & Affiliations
• Board of Directors, The Radiosurgery Society
• The American Association of Physicists in Medicine
• The American Society for Radiation Oncology
Certifications
• Certified Therapeutic Medical Physicist by The American Board of Radiology
Physicist
Xing Liang, PhD, DABR, CMD
Dr. Xing Liang is clinical manager for RPS. He received clinical training at University of Pennsylvania, where he served as chief medical physics resident and instructor. His expertise includes external beam radiation therapy, stereotactic radiosurgery and stereotactic radiation therapy, radiation treatment planning, photodynamic therapy, proton therapy, and brachytherapy. He conducted research in varies of field of radiation physics, optics, and electrical engineering, and is author of 30+ peer reviewed journal articles and book chapters.
Education
University of Illinois at Urbana-Champaign
PhD in Electrical Engineering, 2010
Nankai University
BS and MS in Physics, 2006
Research
Activities & Affiliations
• The American Association of Physicists in Medicine
• The Radiosurgery Society
Certifications
• Certified Therapeutic Medical Physicist by The American Board of Radiology
• Certified Medical Dosimetrist by The Medical Dosimetrist Certification Board
Physicist
Ken Shao-Kang Juan, MS, DABR
Ken received master degree in medical physics from Columbia University, and gained extensive experience in medical physics from clinical work after graduation. He is an expert in both therapeutic clinical medical physics and treatment planning. He also holds medical physics license in New York State.
Education
COLUMBIA UNIVERSITY
MS in Medical Physics, 2010
NATIONAL YANG-MING UNIVERSITY
BS in Medical Radiation Technology, 2004
Activities & Affiliations
• The American Association of Medical Physicists
Certifications
• Certified Therapeutic Medical Physicist by The American Board of Radiology
Physicist
Andrew Cardin, MMP
Andrew received his Master of Medical Physics degree from University of Pennsylvania. As early as his undergraduate education, Andrew has received training and clinical experience over a wide range of treatment modalities and techniques, and has provided regular physics services to more than ten different clinical offices within six different major medical organizations. Andrew has experience performing 3D, IMRT, SRS and SBRT treatment planning.
Education
UNIVERSITY OF PENNSYLVANIA
Master of Medical Physics, 2014
VILLANOVA UNIVERSITY
BS in Physics, 2012
Activities & Affiliations
• American Association of Medical Physicists, Member
Physicist
Lahcen Arhjoul, PhD
Dr. Lahcen Arhjoul received multiple graduate degrees in computer science, nuclear medicine, and medical physics. He received his clinical training at University of Florida in therapeutic medical physics and joined RPS in 2018. He had extensive experience with 3D, IMRT, and VMAT treatment planning, QA of various clinical equipment, design and development of computer algorithms, and LDR/HDR brachytherapy. He is author of 20+ publications.
Activities & Affiliations
• The American Association of Medical Physicists
• Association québécoise des physiciens médicaux cliniques
Education
UNIVERSITY OF SHERBROOKE, QC
PHD in Nuclear Medicine, 2007
UNIVERSITY OF MONTREAL
MS in Medical Physics, 2010
Physicist
Chun-I Lin, PhD.
Activities & Affiliations
• American Association of Medical Physicists, Member
Education
East Carolina University
PHD, 2019
Wayne State University
MS. in Health/Medical Physics, 2014