RAHBAR
RAHBAR MBBSBasics of Radiology • Third Year Deep Learning Master
 ← Year 03 Subjects
YEAR 03 • BASICS OF RADIOLOGY • 20-MODULE • FULL CHAPTER MASTER

Basics of Radiology Learning Material

20 learning units covering imaging selection, modality fundamentals, patient safety and systematic interpretation across major body systems. Read the chapters, revise the key distinctions, then attempt 10 explained questions per unit in practice or assessment mode.

Academic scope: Original RAHBAR notes for the Year 3 clinical transition, covering foundational diagnostic imaging within the RAHBAR MBBS pathway. Institutional sequencing may differ. Examples are educational; clinical decisions and procedures require appropriate supervision and current local protocols. Sources & further reading ↓
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● MODULE 18 / 20

Nuclear Medicine & PET-CT

Understand tracer distribution, functional imaging and the limits of interpreting increased uptake.

Quick revision ↓ Medical Dictionary

FULL CHAPTER EXPLANATION

Deep Learning — Module 18

Connect the clinical question to modality choice, image appearances, limitations and the next decision.

01

The tracer is central

Nuclear medicine uses a radiopharmaceutical whose distribution reflects a selected physiological process. A gamma camera or PET detector records emitted radiation, rather than transmitting an external X-ray beam as in ordinary radiography. The choice of tracer determines what is being measured. A thyroid uptake study, bone scan and glucose-analogue PET study therefore cannot be interpreted using one universal meaning of a hot spot.

02

Functional and anatomical information

Planar imaging, SPECT and PET provide different representations of tracer distribution. Hybrid SPECT-CT or PET-CT combines this with anatomical information, but the CT component may be designed for localization and attenuation correction rather than a full diagnostic contrast examination. Check the actual protocol before assuming that a hybrid study replaces a dedicated anatomical investigation. Motion can also misalign the functional and anatomical images.

03

FDG uptake is not cancer-specific

FDG behaves as a glucose analogue and may accumulate in tumors, inflammation and normal metabolically active tissue. Muscle activity, blood glucose, preparation and timing can affect interpretation. A highly avid focus is not automatically malignant, and a nonavid lesion is not automatically benign. Size, tumor type and technical limits influence detectability, so results must be combined with morphology, history and other investigations.

04

Other useful applications

Bone scintigraphy reflects skeletal tracer activity related to processes such as bone turnover and can show abnormalities before some radiographic changes. It is not a direct map of every cancer cell. Renal studies can assess selected functional or drainage questions, while ventilation-perfusion studies evaluate pulmonary distribution patterns. The report should name the tracer and clinical question so that the meaning and limitations of uptake are clear.

05

Preparation and safety

Provide examination-specific preparation and pregnancy or breastfeeding information to the nuclear medicine team. Some studies require timed imaging or medication review; do not apply generic fasting or drug-stop instructions to all tracers. Aftercare and contact precautions, when needed, depend on the radiopharmaceutical and protocol. Explain that tracer administration and the CT component contribute differently to exposure, and follow the department’s individualized written guidance.

High-Yield Revision

  • Interpret uptake according to the tracer and clinical question.
  • FDG uptake can occur in inflammation and normal tissue.
  • Hybrid CT may not be a full diagnostic CT examination.

Common Exam & Concept Pitfalls

  • A hot spot is not automatically cancer.
  • A nonavid lesion is not automatically benign.

Sources & Further Reading

Curriculum and reference review: 25 September 2026. These original notes teach foundational imaging concepts and clinical reasoning. Interpretation of real studies and procedures requires supervised training. International guidance supports the principles below; local pathways, resources and authorized supervision govern patient care. Faculty review is pending.

RAHBAR study structure: clinical question → modality → technique → systematic findings → interpretation → communication. Use institutional curriculum and faculty guidance for supervised clinical skills and assessment requirements.