CAMRT RTR Exam study guide
CAMRT RTR Exam · Work through your exam, one topic at a time.
The CAMRT Entry-to-Practice Certification Exam is the national certification examination administered by the Canadian Association of Medical Radiation Technologists, which the association describes as Canada's national professional association and certifying body for medical radiation technologists and therapists. Certification is discipline-specific: CAMRT represents four disciplines - radiological technology, magnetic resonance, nuclear medicine and radiation therapy - and candidates write the exam for the discipline they are qualifying in. The CAMRT RTR Exam study guide has 4 sections and about 1,418 words.
01Radiological Technology: Exposure Factors, Image Quality, and Dose Control
In projection radiography, kVp sets beam energy and therefore subject contrast , while mAs sets photon quantity and therefore receptor exposure and quantum noise . The classic trap is carrying film-screen logic into digital imaging: in CR/DR, mAs no longer controls image brightness (window/level does) - it controls noise .
351 words, about 2 min02Magnetic Resonance: Contrast Weighting, Safety, and Image Trade-offs
Tissue contrast in spin echo is set by TR and TE . Short TR + short TE gives T1 weighting (fat bright, fluid dark); long TR + long TE gives T2 weighting (fluid bright); long TR + short TE gives proton density .
368 words, about 2 min03Nuclear Medicine: Radiopharmaceuticals, Instrumentation, and Decay Math
A radionuclide must emit a penetrating gamma of suitable energy with a half-life long enough to image but short enough to limit dose. Tc-99m dominates: 6-hour half-life, 140 keV photon, eluted from a Mo-99/Tc-99m generator (Mo-99 half-life 66 hours) with sterile saline.
346 words, about 2 min04Radiation Therapy: Fractionation, Dosimetry, and Delivery Verification
Absorbed dose is measured in gray (1 Gy = 1 J/kg). Conventional fractionation (~2 Gy per fraction, 5 days/week) exploits the R's of radiobiology : repair of sublethal damage, repopulation, redistribution through the cell cycle, reoxygenation, and intrinsic radiosensitivity.
353 words, about 2 min