Questions
~2 questions in clinical theory exams
Difficulty
Medium
Importance
Core topic for clinical rotation vivas and radiology theory
Overview
Special and Interventional Procedures represent the shift from diagnostic imaging to therapeutic management in clinical radiology. Mastery of these concepts is essential for understanding how medical imaging guides real-time minimally invasive surgeries and early disease detection. Aspirants must grasp the distinct modalities and the procedural logic that differentiates diagnostic imaging from image-guided intervention.
Mammography
Mammography is a specialized low-dose X-ray examination of the breast used for both screening and diagnostic evaluation of breast pathologies. It employs high-contrast resolution and soft tissue differentiation to identify microcalcifications and masses.
- Uses molybdenum or rhodium anodes for optimal soft tissue X-ray energy
- Compression is mandatory to reduce motion artifact and overlap
- Standard views include Cranio-Caudal (CC) and Medio-Lateral Oblique (MLO)
- BI-RADS classification system standardizes reporting for malignancy risk
- Requires specific breast tissue phantom calibration for quality assurance
Angiography Basics
Angiography involves the visualization of blood vessels using radiopaque contrast media injected into the vascular system. It remains the gold standard for assessing vascular anatomy and pathology, often utilizing Digital Subtraction Angiography (DSA) for superior clarity.
- Seldinger technique is the standard for arterial access
- DSA digitally removes bone and soft tissue background structures
- Iodinated contrast media is injected via catheters
- Used for diagnosing stenosis, aneurysms, and vascular malformations
- Requires careful monitoring of contrast-induced nephropathy risks
Interventional Radiology (IR) Overview
Interventional Radiology involves minimally invasive procedures performed under the guidance of medical imaging such as fluoroscopy, ultrasound, or CT. These procedures allow for site-specific treatment with reduced recovery times compared to traditional open surgery.
- Angioplasty and stenting for vessel recanalization
- Embolization for controlling hemorrhage or reducing tumor blood supply
- Image-guided biopsy for tissue sampling
- Drainage of abscesses or fluid collections via percutaneous access
- Requires sterile environment and sedation/local anesthesia protocols
Exam Tip
Always link the modality choice to its specific clinical indication—for example, mention ultrasound for guidance in biopsies and fluoroscopy for real-time vessel navigation.
Common Mistakes
- Confusing the purpose of screening mammography with diagnostic mammography.
- Neglecting to mention the Seldinger technique when describing angiography access.
- Failing to articulate the role of contrast media and the potential for allergic reactions.
More Revision Notes
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