Podcast
Questions and Answers
Which axis represents the patient's right to left direction?
Which axis represents the patient's right to left direction?
- Gantry
- Z-axis
- Y-axis
- X-axis (correct)
What does a negative number on the y-axis indicate?
What does a negative number on the y-axis indicate?
- Cephalad direction
- Caudal direction (correct)
- Anterior direction
- Posterior direction
Which machine component rotates around a vertical axis when the gantry is in the 0-degree position?
Which machine component rotates around a vertical axis when the gantry is in the 0-degree position?
- Gantry
- Collimator (correct)
- Couch
- None of the above
What is the usual degree position for the gantry rotation?
What is the usual degree position for the gantry rotation?
Which axis in the patient represents the horizontal axis around which the gantry rotates?
Which axis in the patient represents the horizontal axis around which the gantry rotates?
Why is consistency necessary in the orientation of axes with respect to the patient?
Why is consistency necessary in the orientation of axes with respect to the patient?
What is the purpose of the graticule in the beam during treatment simulation?
What is the purpose of the graticule in the beam during treatment simulation?
During the simulation procedure, what is determined by measuring the distance from the origin of the coordinate system indicated by reference marks?
During the simulation procedure, what is determined by measuring the distance from the origin of the coordinate system indicated by reference marks?
In treatment simulation, why must the marks made on the patient during data acquisition be realigned with the alignment system?
In treatment simulation, why must the marks made on the patient during data acquisition be realigned with the alignment system?
What is used as a magnification device for transposing internal information onto a transverse contour of the patient?
What is used as a magnification device for transposing internal information onto a transverse contour of the patient?
Which component of the treatment machine determines the angle from which radiation is delivered to the patient?
Which component of the treatment machine determines the angle from which radiation is delivered to the patient?
What is crucial in determining the central axis and extremes of the desired treatment field under fluoroscopic visualization?
What is crucial in determining the central axis and extremes of the desired treatment field under fluoroscopic visualization?
What is the intersection of the horizontal and vertical axes of rotation referred to as?
What is the intersection of the horizontal and vertical axes of rotation referred to as?
Why are alignment systems essential in radiation therapy?
Why are alignment systems essential in radiation therapy?
What is necessary in an alignment system to ensure proper alignment with the sagittal, coronal, and axial planes?
What is necessary in an alignment system to ensure proper alignment with the sagittal, coronal, and axial planes?
In which plane is a contour most frequently obtained for treatment planning purposes?
In which plane is a contour most frequently obtained for treatment planning purposes?
For which field arrangement in radiation therapy is dose typically prescribed at middepth on the central axis?
For which field arrangement in radiation therapy is dose typically prescribed at middepth on the central axis?
Why might it be necessary to obtain contours in multiple planes in areas with irregular external surfaces?
Why might it be necessary to obtain contours in multiple planes in areas with irregular external surfaces?
