ASRT Intrafraction Monitoring and
Respiratory Gating
Which of the following can contribute to random sources of error that vary day to day?
1. Organ stability 2. Anatomic changes 3. Image-guidance errors - answer2 and 3
Which of the following are examples of intrafraction motion? patient positioning,
volumetric changes, patient setup, or unintentional motion - answerunintentional motion
Which of the following are examples or organ motion? 1. Swallowing 2. peristalsis 3.
Heartbeat - answer1, 2 and 3
Which of the following organ are affected by respiratory motion? 1. Lung 2. Liver 3.
Prostate - answer1, 2 and 3
The tumor home position is considered a ______ organ and the position is averaged
over the ______. - answermoving, fraction
Stochastic motion is random in 1. Time 2. Direction 3. Speed - answer1 and 2
______ motion is almost imperceptible changes in position. - answerSystematic
The external intercostal muscle pulls the rib cage ______ and ______, during
inspiration. - answeranterior, superior
Transpulmonary pressure ______ during inhalation and ______ during exhalation. -
answerdecreases, recovers
Effects that are unlikely to occur in exactly the same way for every fraction delivered to
a patient - answerInterplay
The use of any motion-adaptive method that relies on a static beam-to-patient
relationship (2 answers) - answerGating, 4-D CT
During regular breathing, with the same transpulmonary pressure, the deflating lung
volume is larger than the inflating volume. - answerHysteresis
Predict the spatial location of a tumor or organ when its actual position cannot be
directly observed. - answerSurrogate
During normal respiration, lung volume changes approximately ______ %. - answer20
Respiratory Gating
Which of the following can contribute to random sources of error that vary day to day?
1. Organ stability 2. Anatomic changes 3. Image-guidance errors - answer2 and 3
Which of the following are examples of intrafraction motion? patient positioning,
volumetric changes, patient setup, or unintentional motion - answerunintentional motion
Which of the following are examples or organ motion? 1. Swallowing 2. peristalsis 3.
Heartbeat - answer1, 2 and 3
Which of the following organ are affected by respiratory motion? 1. Lung 2. Liver 3.
Prostate - answer1, 2 and 3
The tumor home position is considered a ______ organ and the position is averaged
over the ______. - answermoving, fraction
Stochastic motion is random in 1. Time 2. Direction 3. Speed - answer1 and 2
______ motion is almost imperceptible changes in position. - answerSystematic
The external intercostal muscle pulls the rib cage ______ and ______, during
inspiration. - answeranterior, superior
Transpulmonary pressure ______ during inhalation and ______ during exhalation. -
answerdecreases, recovers
Effects that are unlikely to occur in exactly the same way for every fraction delivered to
a patient - answerInterplay
The use of any motion-adaptive method that relies on a static beam-to-patient
relationship (2 answers) - answerGating, 4-D CT
During regular breathing, with the same transpulmonary pressure, the deflating lung
volume is larger than the inflating volume. - answerHysteresis
Predict the spatial location of a tumor or organ when its actual position cannot be
directly observed. - answerSurrogate
During normal respiration, lung volume changes approximately ______ %. - answer20
