Podcast
Questions and Answers
Varian MLC is an example of which of the following?
Varian MLC is an example of which of the following?
- Upper jaw replacement
- Tertiary collimator system (correct)
- None of these
- Lower jaw replacement
In Elekta MLC, leaves move in which direction?
In Elekta MLC, leaves move in which direction?
- X direction (correct)
- Z direction
- Can move in all three directions
- Y direction
What material is most commonly used for custom blocks?
What material is most commonly used for custom blocks?
- Iron
- Cerrobend (correct)
- Lead
- Aluminium
What is the melting point of Lipowitz metal?
What is the melting point of Lipowitz metal?
The permissible limit of X-ray transmission through MLC should be less than which percentage?
The permissible limit of X-ray transmission through MLC should be less than which percentage?
The thickness of the shielding material depends on which factor?
The thickness of the shielding material depends on which factor?
Asymmetric jaws are used to treat which type of cancer?
Asymmetric jaws are used to treat which type of cancer?
What is the required lead thickness to reduce 5% of 10MV photon?
What is the required lead thickness to reduce 5% of 10MV photon?
What is the most commonly used Cerrobend block?
What is the most commonly used Cerrobend block?
For 2D treatment planning of head and neck cancers, which field arrangement is most commonly used?
For 2D treatment planning of head and neck cancers, which field arrangement is most commonly used?
Flashcards
Varian MLC
Varian MLC
A tertiary collimator system used in linear accelerators to shape the radiation beam.
Shielding Block Distance
Shielding Block Distance
The position of a shielding block from the patient's skin surface is approximately 5 cm.
Elekta MLC movement
Elekta MLC movement
In Elekta MLC, leaves move in the X direction.
Custom Block Material
Custom Block Material
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Lipowitz Metal Melting Point
Lipowitz Metal Melting Point
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MLC Transmission Limit
MLC Transmission Limit
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Shielding Thickness Factor
Shielding Thickness Factor
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Asymmetric Jaws Usage
Asymmetric Jaws Usage
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Lead Thickness for 10MV Photons
Lead Thickness for 10MV Photons
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Cerrobend Thickness
Cerrobend Thickness
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Study Notes
- Variant MLC is an example of a tertiary collimator system.
- The position of the shielding block from the patient's surface is usually 15cm.
- In Elekta MLC leaves move in the x-direction.
- Lead is the most commonly used material for custom blocks
- The melting point of Lipowitz metal is 70°C.
- The permissible limit of X-ray transmission through MLC should be less than 2%.
- The thickness of the shielding material depends on the energy of radiation.
- Asymmetric jaws are used to treat Ca-Cervix.
- The required lead thickness to reduce 5% of 10MV photon is 5cm.
- The thickest of the most commonly used Cerrobend block is 7.5cm.
- The ideal treatment planning in Head & Neck cancer is IMRT.
- Intraluminal RT is used in Ca-Esophagus.
- BCT is applicable for early breast cancer.
- Co-60 unit gives better results than IMRT/3D CRT in early glottic cancer.
- Wedges are used in the treatment planning of all of these: larynx, brain, and maxilla.
- The fields most commonly used for 2D treatment planning in the head & neck are AP/PA.
- The immobilization device used for chest wall irradiation in Ca-breast is breast board.
- The organs at risk in treatment planning of Ca-esophagus are lungs.
- Surgery and RT give comparable results in early oral cavity cancer.
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