St. Jude Research
Chair: Thomas E. Merchant, DO, PhD

Department of Radiation Oncology

  

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About the department

The mission of the Department of Radiation Oncology is to improve pediatric cancer cure rates and minimize treatment-related long-term side effects. Radiation therapy has historically been considered a pillar of cancer therapy and here at St. Jude, it has long been instrumental in advancing treatment strategies for several types of pediatric cancers. Our faculty are reimagining pediatric radiation therapy and redefining its scope. 

Our team provides pediatric and young adult cancer patients with expert and compassionate clinical care in close collaboration with pediatric oncologists, surgeons and other medical specialists. The department fully embraces St. Jude’s “bench to bedside” mission and strives to conduct innovative research that advances knowledge and improves the outlook for all children. We are refining and redefining the role of imaging in pediatric radiation therapy in cancer treatment through utilizing the latest technologies and by leveraging valuable institutional and global collaborations.

Research

The Department of Radiation Oncology is performing critical research in the fields of pediatric oncology, pediatric radiation oncology and medical physics. We are exploring new indications for irradiation and combined modality therapy, intelligent sequencing and advanced technology including proton therapy. These endeavors are allowing us to focus on advancing cures for pediatric cancers with the lowest survival rates as well as for children with relapsed disease. 

We are also optimizing radiation therapy in order to deliver the precise type and amount of therapy needed to maintain survival rates while reducing the overall burden of therapy. This allows us to reduce the toxicity of cancer therapy and enhance the quality of life for the children we treat. 

man working in radiation lab

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Technology and protocols

The Department of Radiation Oncology is devoted to providing the highest quality patient care through integrating cutting-edge imaging technologies into all aspects of the radiation therapy process and conducting novel pediatric-focused research. 

  1. Photon and proton therapy

    Our state-of-the-art facilities include a 25,000 square foot Proton Therapy Center, featuring a synchrotron-based pencil beam scanning proton therapy system with two gantry rooms and a fixed beam room. Each room is equipped with high-precision patient positioning and image guidance systems. Adjacent to the proton treatment rooms are PET/CT and 3.0T MRI systems, both equipped for treatment planning. The department has a 20,000 square foot Photon Therapy Center and clinic dedicated to pediatric radiation oncology. The photon center is equipped with a Varian TrueBeam, a 1.5T MRI, and a Spectral CT unit dedicated to treatment planning.

  1. Magnetic resonance simulators

    Our department houses two wide-bore helium-efficient magnetic resonance (MR) simulators (Philips Ingenia 1.5T and 3.0T) for advanced 3D high-resolution imaging with receiver-coil arrangements tailored to pediatric radiotherapy patients. We have utilized these machines to analyze protocol-specified serial MR imaging acquired on diagnostic imaging systems after radiotherapy as well as investigated radiation-induced changes in cerebral white matter, brainstem and cerebral vasculature. 

    Our approach has increased our understanding of tumor/anatomic changes during a course of radiotherapy and long-term radiation-related effects in critical organs in children at different developmental stages. 

  1. Novel computed tomography imaging in treatment planning

    Our department has a first-generation detector-based spectral computed tomography (CT) (Philips IQon), offering a rotation speed of 0.27s, model-based iterative reconstruction and the capability to synthesize various spectral images in a single scan. This system has allowed for more rapid CT simulation acquisition, reduced metal implant artifact and enhanced iodine contrast in tumor with low keV (40-50 keV) monoenergetic images with or without reducing CT contrast dose during supply shortage. 

  1. Stopping power dose calculation in treatment planning

    We have developed and experimentally validated our in-house tool of stopping power images with proton irradiation of animal tissues and phantoms. Our next step will move toward clinical implementation of direct stopping power dose calculation and virtual non-contrast CT to achieve single-scan CT simulation for proton therapy.

  1. Image-guided proton radiotherapy

    We can perform in-room cone beam CT (CBCT) and use a ceiling-mounted robotic CBCT for daily volumetric image guidance. This capability enables us to visualize patient soft-tissue anatomy daily and position patients accurately without incorporating overly large setup uncertainty in scenario-based robust optimization. Our findings and practice recommendations have been widely disseminated through publications and presentations. 

  1. Adaptive proton planning

    Our image-guidance research has made a clinical impact on patients undergoing proton therapy. Our studies have produced unique data on pediatric site-specific setup uncertainty to account for in-treatment plan design and identified risk factors for outliers with large motion artifacts. A hybrid method of correcting CBCT for proton therapy dose calculation with deep learning and deformable image registration was developed and clinically implemented to facilitate same-day dose recalculation and decision for adaptive replan in patients with significant anatomic changes. We are currently designing a prospective protocol to utilize daily imaging to better characterize anatomic changes in pediatric patients and improve adaptive proton therapy workflow. All these imaging-related research efforts used cutting-edge imaging resources to target tumors with high accuracy and to reduce radiation-associated toxicity in children. 

Chair

Clinical Faculty

Medical Physics Faculty

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    Chia-ho Hua, PhD

    Member, St. Jude Faculty

    Director of Medical Physics Research, Radiation Oncology Department

    Chia-ho Hua, PhD

    Member, St. Jude Faculty

    Director of Medical Physics Research, Radiation Oncology Department

    View Full Profile Explore Chia-ho Hua's research

    Affiliations

    Department of Radiation Oncology

    Comprehensive Cancer Center

    Neurobiology and Brain Tumor Program

    Research Interests

    • Improving proton therapy targeting accuracy
    • Advanced imaging for precision radiation therapy
    • Predictive modeling for tumor response and treatment late effects

    Contact Information

    Chia-ho Hua, PhD

    Radiation Oncology

    MS 210, Room I3133

    St. Jude Children's Research Hospital

    262 Danny Thomas Place

    Memphis, TN 38105-3678

    (901) 595-3610 (phone)

    (901) 595-3113 (fax)

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    Ozgur Ates, PhD, DABR

    Assistant Member, St. Jude Faculty

    Ozgur Ates, PhD, DABR

    Assistant Member, St. Jude Faculty

    View Full Profile Explore Ozgur Ates's research

    Affiliations

    Department of Radiation Oncology

    Research Interests

    • Adaptive proton therapy
    • Surface guided radiation therapy
    • Motion management strategies
    • DECT-based proton dose calculations
    • Safety and toxicity analysis
    • Particle therapy metrology systems

    Contact Information

    Ozgur Ates, PhD, DABR

    Radiation Oncology

    MS 210

    St. Jude Children's Research Hospital

    262 Danny Thomas Place

    Memphis, TN 38105-3678

    (901) 595-2404 (phone)

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    Andrew J. Boria, PhD, DABR

    Assistant Member, St. Jude Faculty

    Andrew J. Boria, PhD, DABR

    Assistant Member, St. Jude Faculty

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    Affiliations

    Department of Radiation Oncology

    Research Interests

    • Implementing AI-based whole body pediatric auto-segmentation
    • Evaluating the safety and effectiveness of proton therapy for children with cancer
    • Implementing pulsed reduced dose rate radiotherapy for large-volume recurrent cancer
    • Evaluating patient positioning on accuracy of craniospinal pediatric proton therapy

    Contact Information

    Andrew J. Boria, PhD, DABR

    Radiation Oncology

    MS 210

    St. Jude Children's Research Hospital

    262 Danny Thomas Place

    Memphis, TN 38105-3678

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    Chin-Cheng Chen, PhD, DABR

    Associate Member, St. Jude Faculty

    Chin-Cheng Chen, PhD, DABR

    Associate Member, St. Jude Faculty

    View Full Profile Explore Chin-Cheng Chen's research

    Affiliations

    Department of Radiation Oncology

    Research Interests

    •  Implementing clinical physics workflows, quality assurance measures and adoption of cutting-edge treatment planning techniques
    • Developming tailored, patient-specific treatments 

    Contact Information

    Chin-Cheng Chen, PhD, DABR

    Department of Radiation Oncology

    MS 210, Room IP304

    St. Jude Children's Research Hospital

    262 Danny Thomas Place

    Memphis, TN 38112

More information

Studies and clinical trials

Related topics

Selected publications

Response of bilateral Wilms tumor to chemotherapy suggests histologic subtype and guides treatment
Duncan et al. J Natl Cancer Inst, 2024
Radiation therapy dose escalation achieves high rate of local control with tolerable toxicity profile in pediatric and young adult patients with Ewing sarcoma
Kacar et al. Cancer, 2024
Performance analysis and knowledge-based quality assurance of critical organ auto-segmentation for pediatric craniospinal irradiation
Hanna et al. Sci Rep, 2024
Proton therapy and limited surgery for paediatric and adolescent patients with craniopharyngioma (RT2CR): A single-arm, phase 2 study
Merchant et al. Lancet Oncol, 2023
ATM inhibition enhances the efficacy of radiation across distinct molecular subgroups of pediatric high-grade glioma
Xie et al. Neuro Oncol., 2023

View current openings

Medical Physics Assistant
The World’s Best Stop at Nothing There’s a reason St. Jude Children’s Research Hospital is consistently ranked on Glassdoor’s “Best Places to Work” list. Actually, there are more than 6,500 reasons. At our world-class pediatric research hospital, every one of our 6,500 professionals shares our commitment to making a difference in the lives of the children we serve. There’s a unique bond when you are part of a team that will stop at nothing to advance the treatments and cures of pediatric catastrophic diseases. The result is a collaborative, positive environment where all employees, regardless of their role, receive the resources, support, and encouragement to advance and grow their careers.Performs routine quality assurance services under direction of Qualified Medical Physicist on photon/proton treatment machines, imaging systems, and patient-specific quality assurance, including the collection and processing of treatment-related data. Assists in maintaining physics equipment and organizing documentation related to radiation physics, equipment calibration, and quality assurance. Supports the implementation of radiation safety protocols and assists in maintaining and reporting department quality improvement plans and quality control programs.Job Responsibilities:Under direction, perform routine services (e.g., photon/proton treatment machine, imaging systems, patient-specific QA, collection and processing of treatment-related data).Assist in maintenance of physics section equipment.Organize and document records related radiation physics, equipment calibration, and quality assurance.Assist in implementation of radiation safety protocols.Assist in implementing, maintaining and reporting department quality improvement plans and quality control programs.Perform other duties as assigned to meet the goals and objectives of the department and institution.Maintain regular and predictable attendance.Minimum Education and/or Training:Bachelor's degree in physical sciences or related field required, bachelor's in physics preferred.Master's in physics preferred.Minimum Experience:2+ years of relevant experience preferred.CompensationIn recognition of certain U.S. state and municipal pay transparency laws, St. Jude is including a reasonable estimate of the compensation range for this role. This is an estimate offered in good faith and a specific salary offer takes into account factors that are considered in making compensation decisions including but not limited to skill sets, experience and training, licensure and certifications, and other business and organizational needs. It is not typical for an individual to be hired at or near the top of the salary range and compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current salary range is $29.00 - $50.50 per hour for the role of Medical Physics Assistant.Explore our exceptional benefits!St. Jude is an Equal Opportunity EmployerNo Search FirmsSt. Jude Children's Research Hospital does not accept unsolicited assistance from search firms for employment opportunities. Please do not call or email. All resumes submitted by search firms to any employee or other representative at St. Jude via email, the internet or in any form and/or method without a valid written search agreement in place and approved by HR will result in no fee being paid in the event the candidate is hired by St. Jude.
Medical Physicist Faculty Position, Department of Radiation Oncology
St. Jude Children's Research HospitalThe Department of Radiation Oncology at St. Jude Children’s Research Hospital is recruiting medical physicists to join its physics faculty. Appointments are available on either the clinical track or the clinician-scientist track, with academic rank determined by the candidate’s expertise, experience, and record of achievement. The successful candidate will have a PhD in medical physics, engineering, or related physical science. Applicants should hold a PhD in medical physics, engineering, or related physical science. Certification in radiation oncology physics by ABR, ABMP, or CCPM - or eligibility for certification - is highly desirable. Board certification is expected within three years of hire. Candidates trained at foreign institutions who meet the requirements for the ABR alternative certification pathway will also be considered.The department is dedicated to the research and treatment of pediatric patients, with a particular emphasis on investigator-initiated clinical trials for brain, musculoskeletal, and solid tumors. Preference will be given to candidates with a strong interest in developing innovative methods for targeting, treatment planning, delivery, and outcome modeling in children treated with photon and proton beams. The department actively supports the partnership between St. Jude and the International Atomic Energy Agency (IAEA) to address inequality in global childhood cancer care creating unique opportunities for faculty interested in global pediatric medicine. The department supports four clinician-scientist track faculty physicists, six clinical-track faculty physicists, four dosimetrists, two medical physics assistants, and dedicated engineering, information systems, and research staff - including research scientists, postdoctoral fellows, and clinical research associates. The team also includes five full-time pediatric radiation oncologists, as well as supportive nursing, radiation therapy, and child life specialist teams. As one of the largest pediatric radiation oncology facilities in the world, the department treats approximately 300 children, adolescents, and young adults each year.The St. Jude Proton Therapy Center is the only proton therapy facility in the world dedicated exclusively to treating children with cancer. The center is equipped with the Hitachi PROBEAT-V System, featuring two gantry rooms and a fixed beam room. Each room is outfitted with high-precision patient positioning, volumetric CBCT, planar image-guidance systems, and a dedicated pencil-beam scanning nozzle. Video-based surface image guidance is also available.The department is centrally located and encompasses 45,000 square feet of clinical space, including a dedicated clinic, treatment planning, therapy, and anesthesia support areas. Additionally, the department houses a Varian TrueBeam linear accelerator system with image guidance. There are multiple imaging systems in the department (CT, PET/CT, 1.5T MR, and 3.0T MR) dedicated to treatment planning and on-treatment assessment.St. Jude Children’s Research Hospital, named as one of the best places to work, is dedicated to supporting the professional and career development of faculty allowing for protected time and support based on effort distribution and responsibilities. St. Jude faculty receive generous benefits, such as retirement compensation plans, professional development allowance, and tuition assistance.How to apply:Interested candidates should submit their curriculum vitae, a letter outlining their career plans and interests that align with the Department’s mission, and the names of three references directly online.For more information:Chia-Ho Hua, PhD, Member, Director of Medical Physics ResearchandChin-Cheng Chen, PhD, Associate Member, Chief Clinical PhysicsDepartment of Radiation OncologySt. Jude Children’s Research Hospital262 Danny Thomas Place, MS 210Memphis, TN 38105Chia-ho.hua@stjude.orgChin-cheng.chen@stjude.org St. Jude is an Equal Opportunity EmployerNo Search FirmsSt. Jude Children's Research Hospital does not accept unsolicited assistance from search firms for employment opportunities. Please do not call or email. All resumes submitted by search firms to any employee or other representative at St. Jude via email, the internet or in any form and/or method without a valid written search agreement in place and approved by HR will result in no fee being paid in the event the candidate is hired by St. Jude.

Contact us

Department of Radiation Oncology
MS 210, Room I3131
St. Jude Children's Research Hospital
262 Danny Thomas Place
Memphis, TN 38105-3678

Email: thomas.merchant@stjude.org
Phone: (901) 595-3604
Fax: (901) 595-3113

Preferred contact method: Phone