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WorksheetsMedical Diagnostic Imaging and Radiotherapy
Total questions: 12
Worksheet time: 6mins
Which parameter is primarily measured by a DEXA scan?
Bone mineral density levels
Bone marrow cellularity
Trabecular thickness ratio
Serum calcium concentration
What principle allows DEXA to differentiate bone from soft tissue?
Magnetic spin resonance
Ultrasound echo timing
Gamma ray scattering counts
Dual energy X‑ray absorption
Which statement best describes radiation exposure from DEXA?
High and operator‑dependent
Very low and non‑invasive
None and purely optical
Moderate and invasive
Beyond osteoporosis diagnosis, DEXA can be used to assess which outcome?
Neuron synapse density
Cortical blood perfusion
Liver enzyme production
Body composition changes
Molecular imaging primarily enables visualization at what level?
Molecular and cellular processes
Gross anatomical structures
Biomechanical joint motion
Macroscopic organ perfusion
Which modality is NOT typically categorized under molecular imaging?
Positron emission tomography
Single‑photon emission computed tomography
Magnetic resonance imaging
Conventional ultrasound Doppler
Radiotracers used in molecular imaging are designed to do what?
Target specific molecules or cells
Increase radiation dose uniformly
Enhance general image brightness
Block immune cell trafficking
Which clinical domain most extensively uses molecular imaging for staging and treatment planning?
Dermatology wound care
Oncology patients and therapies
Psychiatry mood disorders
Ophthalmology retinal exams
Radiotherapy achieves tumor control primarily through which mechanism?
Blocking angiogenesis directly
Lowering systemic hormone levels
DNA damage preventing division
Enhancing immune memory cells
External beam radiotherapy typically uses which equipment to deliver treatment?
Linear accelerators machines
Surgical proton catheters
Endoscopic gamma cameras
Handheld beta emitters
Which option correctly contrasts external radiotherapy and brachytherapy?
External places seeds inside; brachy uses wide field beams
External uses distant beams; brachy places sources near tumor
External requires anesthesia; brachy never uses implants
External treats only skin; brachy only treats brain
Which advanced technique focuses on precise dose shaping to spare healthy tissue?
Intensity‑modulated radiation therapy
Whole‑body scatter irradiation
Fixed rectangular beam therapy
Uniform parallel‑opposed fields
