A medical dosimetrist designs the radiation treatment plan that kills a tumor while sparing healthy tissue. You contour structures on CT/MRI/PET images, arrange beams, run dose calculations, and check your plan against the physician's prescription and constraints. Most US dosimetrists first become radiation therapists (ARRT-certified) or have a physics or science bachelor's, then complete a JRCERT-accredited dosimetry program (certificate or master's) and pass the MDCB exam. This is a clinical-training pathway, not a self-taught one, so free learning builds your foundation and your application
See the full roadmap free
Every stage from beginner to expert, with lessons, practice drills, projects, interview questions and free resources. Free with a Rolearch account.
Stage 1 of 3 · about 16 weeks
Understand radiation physics, anatomy, and the radiation oncology workflow well enough to enter a radiation therapy or dosimetry program.
Radiation physics and dose basics
Every plan rests on how radiation interacts with tissue. If you understand attenuation and dose, plan choices make sense instead of being button-clicking.
Cross-sectional anatomy
You will outline organs on CT and MRI slices. You must recognize them in axial, sagittal and coronal views.
Math for dose calculation
You calculate or verify monitor units and fractionation. Errors here harm patients.
Radiation oncology workflow and radiation safety
Knowing the path from consult to simulation, planning, QA, and treatment shows where you fit and why each step exists.
Then 2 more stages (about 108 weeks in all) with lessons, drills, projects, 6 interview questions with strong answers and free resources.