A Patient Is to Be Treated with a Pelvic Field

question 24

Multiple Choice

A patient is to be treated with a pelvic field on a linear accelerator.The patient is quite obese and the port films show that the field shifts superiorly and inferiorly on a daily basis.What bony landmark may measurements be taken from to stabilize this treatment portal?

• A) Umbilicus
• B) Anterior superior iliac spine (ASIS)
• C) Pubic symphysis
• D) Patella

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Definitions:

Therians

Mammals excluding the monotremes, comprising the live-bearing marsupials and placental mammals, characterized by traits such as viviparity and mammary glands.

Therapods

A group of bipedal dinosaurs, mostly carnivorous, that includes modern birds and their extinct ancestors like Tyrannosaurus rex.

Tyrannosaurus

Tyrannosaurus is a genus of theropod dinosaurs that lived approximately 68 to 66 million years ago, known for being one of the largest land predators of its time.

Homology

Refers to the existence of shared ancestry between a pair of structures, or genes, in different species.