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Questions and Answers
What type of technique involves delivering dosage to only one port/field?
What type of technique involves delivering dosage to only one port/field?
Single Field Dosage
Which technique involves delivering dosage between 2 or more portals of entry?
Which technique involves delivering dosage between 2 or more portals of entry?
Crossfire Technique
What is the purpose of the Quadratic (Box Technique)?
What is the purpose of the Quadratic (Box Technique)?
Deliver dosage using 4 fields
When is the Perpendicular Field technique used?
When is the Perpendicular Field technique used?
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What is the primary purpose of the Wedge Field technique?
What is the primary purpose of the Wedge Field technique?
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When is the Mantle Field technique typically employed?
When is the Mantle Field technique typically employed?
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Why is radiation given preoperatively before surgery for tumor treatment?
Why is radiation given preoperatively before surgery for tumor treatment?
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What is the purpose of using a simulator in radiotherapy?
What is the purpose of using a simulator in radiotherapy?
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What is the significance of SAD (Source-Axis Distance) in radiotherapy?
What is the significance of SAD (Source-Axis Distance) in radiotherapy?
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What does SSD (Source-Skin Distance) refer to in radiotherapy?
What does SSD (Source-Skin Distance) refer to in radiotherapy?
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What is the purpose of STD (Source-Tumor Distance) in radiation treatment?
What is the purpose of STD (Source-Tumor Distance) in radiation treatment?
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Describe the process of treatment planning in radiotherapy.
Describe the process of treatment planning in radiotherapy.
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Study Notes
Verification and Dosimetry in Radiation Oncology
- Dosimetry checking and record keeping are essential in radiation oncology
- The target volume is the tumor site or area to be treated
Factors to Consider Before Treatment
- Patient's overall physical and emotional condition
- Type and stage of tumor
- Histology type of tumor
- Extent and anatomic position of tumor
- Time-dose fractionation
- Radiation oncology unit capabilities
- Goal of treatment: cure, pre-operative, or post-operative palliation
Procedures of Isodose Planning
- Single Field Dosage: delivers dosage to only one port/field, used for skin cancer treatment
- Opposing Ports: delivers dosage to field-1 and field-2
- Crossfire Technique: uses 2 or more portals of entry
- Quadratic (Box Technique): delivers dosage to 4 fields
- Multiple Fields: expands opposing ports, delivering dosage to 3 or more fields
- Perpendicular Field: delivers dosage perpendicularly
- Rotational Field: the source rotates around the patient, used for esophageal cancer treatment
- Tangential Field: uses tangential projection for breast or superficial tumor treatment
- Wedge Field: alters the primary beam to accomplish treatment goal, uses a wedge-shaped Pb block
Other Techniques
- Mantle Field: used for upper tumor treatment, targeting major lymph node groups above the diaphragm
- Inverted-Y (Hockey Stick): used for lower tumor treatment, targeting para-aortic inguinal lymph nodes with a central pelvic block
- Chemotherapy: used for systemic treatment of micro-metastases in patients with extensive or chemo-sensitive tumors
- Pre-Operative Technique: radiotherapy followed by surgery or chemotherapy
- Post-Operative Technique: surgery followed by radiotherapy treatment
Simulator in Radiation Therapy
- Localizes target volume and normal tissue
- Localizes boundary of noninvolved organs
- Visualizes the plan of treatment fields
- Uses X-ray fluoroscopy, CT or MRI images, and ultrasonography
Distances Used in Radiotherapy
- SAD (Source-Axis Distance): distance from treatment source to target tumor
- SSD (Source-Skin Distance): distance from source to skin surface
- STD (Source-Tumor Distance): distance from source to target tumor
Treatment Planning
- Requires decisions on volume selection and location of treatment
- Decides on dose to be delivered
- Determines how the volume is treated: teletherapy or brachytherapy
- Computes dosage
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Description
Test your knowledge on the verification of set-up and portal imaging, dosimetry checking, target volume considerations, and factors impacting treatment decisions in radiation therapy planning.
