Radiology
Imaging Techniques
| Technique | Mechamism | Detect | Contrast |
|---|---|---|---|
| CT | Transmission | X-ray | Barium & Iodine |
| MRI | Emission | Radiofrequency wave | Gadolinium |
| SPECT | Emission | γ-ray | - |
| PET | Emission | γ-ray | - |
Contraindications to Contrast
Barium
- Previous adverse reactions
- Gastrointestinal perforation
Iodine
- Previous adverse reactions
- Acute kidney injury (AKI)
Positioning of Skull X-ray
- Caldwell view
- Waters view
- Submental view
- Towne view
- Lateral view
Systematic Analysis of Chest X-ray {ABCDEFG}
- Airway & Adenopathy
- Bone & Breast
- Cardiovascular
- Diaphragm
- Esophagus
- Field
- Gastric
Magnetic Resonance (MR) Imaging Mechanism
| Short TE | Long TE | |
|---|---|---|
| Short TR | T1-weighted (T1) | - |
| Long TR | Proton density (PD) | T2-weighted (T2) |
- Repetition time (TR)
- Echo time (TE)
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Radioactive Decay
Radiopharmaceuticals for Diagnosis
| Medication | Indications |
|---|---|
| 18F-fluorodeoxyglucose (FDG) | Malignancy |
| 99mTc-methylene diphosphonate (MDP) | Bone scan |
| 67Ga | Inflammation |
| 18F-fluorodopa | Parkinson disease |
| 201Tl | Heart |
| 99mTc-tetrofosmin | Heart |
| 133Xe | V/Q scan :: ventilation scan |
| 99mTc-macroaggregated albumin (MAA) | V/Q scan :: perfusion scan |
| 123I | Thyroid |
| 99mTc-pertechnetate | Meckel diverticulum |
| 99mTc-sestamibi | Heart & Parathyroid |
| 131I-iodocholesterol | Adrenal adenoma |
| 123I-metaiodobenzylguanidine (MIBG) | Pheochromocytoma |
Percentage Depth Dose Curve
