Radiation Therapy Treatment Planning
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Questions and Answers

What is the primary aim of treatment planning?

  • To create a three-dimensional rendering of the patient outline
  • To deliver uniform dose to the target volume and minimize dose to surrounding tissues (correct)
  • To separate the target volume into distinct regions
  • To maximize radiation beam orientations

What is the Gross Tumor Volume (GTV)?

  • The volume of tissue that receives a dose considered significant in relation to tissue tolerance
  • The tissue volume that contains the GTV and subclinical microscopic disease
  • The volume of tissue enclosed by an isodose surface
  • The gross palpable, visible, and demonstrable extent and location of malignant growth (correct)

What is the Clinical Target Volume (CTV)?

  • The gross palpable, visible, and demonstrable extent and location of malignant growth
  • The volume of tissue that receives a dose considered significant in relation to tissue tolerance
  • The volume of tissue enclosed by an isodose surface
  • The tissue volume that contains the GTV and subclinical microscopic disease (correct)

What is the Planning Target Volume (PTV)?

<p>The CTV and includes margins for geometric or position uncertainties (A)</p> Signup and view all the answers

What is the primary purpose of the Planning Target Volume (PTV)?

<p>To allow for limitations in treatment technique (C)</p> Signup and view all the answers

What is the Treated Volume?

<p>The volume of tissue enclosed by an isodose surface, selected and specified by the radiation oncologists (B)</p> Signup and view all the answers

What is the primary purpose of a conventional simulator in radiotherapy?

<p>To localize the target volume and normal tissue (D)</p> Signup and view all the answers

What is the purpose of the graduated scale or grid in the head of the conventional simulator gantry?

<p>To broadcast an image of two perpendicularly crossed axes onto the patient's skin (D)</p> Signup and view all the answers

What is the process of defining the treatment target and outlining organs in radiotherapy?

<p>Target definition and outlining (A)</p> Signup and view all the answers

What is the role of the X-axis in the XYZ coordinate system used for isocenter localization?

<p>Extending right to left in the patient (A)</p> Signup and view all the answers

What is the primary difference between a conventional simulator and a CT simulator in radiotherapy?

<p>The use of virtual simulation (B)</p> Signup and view all the answers

What is the purpose of radiographs taken during conventional simulation?

<p>To document the gantry angles, field sizes, collimator angles, and table angles (D)</p> Signup and view all the answers

What is the purpose of digitally reconstructed radiographs in the treatment planning process?

<p>To visualize internal structures for tumor localization (D)</p> Signup and view all the answers

Why is it important to position the patient in a reproducible manner during simulation?

<p>To ensure accurate alignment of the radiation fields (B)</p> Signup and view all the answers

What is the purpose of immobilization devices in simulation?

<p>To maintain patient position during simulation (D)</p> Signup and view all the answers

What is the primary function of field lights in patient alignment?

<p>To align the radiation fields on the patient (A)</p> Signup and view all the answers

What is the purpose of the protractor or gantry angle indicator?

<p>To indicate the gantry angle during treatment (D)</p> Signup and view all the answers

What is the role of lasers in patient alignment?

<p>To provide a visual cue for patient positioning (D)</p> Signup and view all the answers

Flashcards

Treatment Planning Aim

To deliver uniform dose to the target volume and minimize dose to surrounding tissues.

Gross Tumor Volume (GTV)

The detectable extent and location of malignant growth.

Clinical Target Volume (CTV)

Tissue volume containing GTV and subclinical disease.

Planning Target Volume (PTV)

CTV plus margins for uncertainties in treatment.

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PTV Purpose

To accommodate limitations in treatment technique.

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Treated Volume

Tissue volume enclosed by a specified isodose surface.

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Conventional Simulator Purpose

To localize target volume and surrounding normal tissue.

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Simulator Grid Purpose

To project crossed axes images onto the patient's skin.

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Target Definition Process

Defining treatment target and outlining organs in radiotherapy.

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X-axis Role

Extends right to left in the patient’s coordinate system.

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Conventional vs CT Simulator

CT simulators use virtual simulation techniques.

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Radiographs Purpose

Document gantry angles, field sizes, and angles during simulation.

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Digitally Reconstructed Radiographs Purpose

To visualize internal structures for better tumor localization.

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Patient Positioning Importance

Ensures accurate alignment of radiation fields during treatment.

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Immobilization Devices Purpose

To keep patient in the same position during simulation.

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Field Lights Function

Align the radiation fields with the patient's treatment area.

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Protractor Purpose

Indicates the gantry angle during the treatment process.

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Lasers Role

Provide visual cues for accurate patient positioning during simulation.

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