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What test do you use to find out how many white blood cells a person has?
A) CBC (cell count)
(this multiple choice question has been scrambled)
What do you use lead in the nose?
to protect the internal membrane & to keep the radiation from going to deep and also to protect the lens
What is the most radio-resistant Lung Cancer?
Small cell is the most aggressive;
What is the treatment for Glioma?
Surgery (then observation); if needed do post op radiation
absence of a body part
What is the location of suprasternal notch?
The patient received whole body irradiation. What causes death?
Cerebrovascular Syndrome occurs after 10,000 cGy
What are the treatment fields for lungs?
AP/PA parallel opposed (typically includes primary tumor volume and adjacent mediastinum)
What is TPR?
Ratio of the absorbed dose at a given depth in a phantom to the absorbed dose at the same point at a reference depth in phantom.
TPR= dose in tissue/dose in phantom
What is the photoelectric interaction?
- only interaction with the capacity to produce a useful image on the film.
- Incident photon penetrates deep into the atom and ejects an inner shell electron
Ascites is a common symptom of what type of cancer?
- Extended abdomen
- accumulation of fluid in the abdominal (peritoneal) cavity
Small, white raised patches on the mucous membrane
What is the treatment for low grade glioblastoma?
- surgery (gross total resection) followed by observation
- radiation if needed post op 50-55 Gy
What is the anatomy of the hypo-pharynx?
- pyriform sinuses (most common)
- post cricoid
- lower posterior pharyngeal walls below the base of the tongue
level of the C3-C6
What is TMR?
dose in tissue/dose in phantom (d-max)
What is TAR?
The ratio of the absorbed dose at a given depth in phantom to the absorbed dose at the same point in free space
TAR = dose in tissue/ dose in air
Describe the Compton interaction
produced when an x-ray photon interacts with an outer shell orbital electron with sufficient energy to eject the photon from orbit and alter is own path
low white blood cells
What does pituitary effect?
The pituitary is the "thermostat" that controls all the other glands that secrete hormones
What is the function of a scattering foil?
- used in electron mode.
- The target is retracted and a scattering foil that matches the electron energy called for is moved into place
What is the function of the flattening filter?
shapes the x-ray beam in its cross sectional dimensions
What is beneficience?
Doing good, and calls on health care professionals to act in the best interest of patients, even when it might be inconvenient or sacrifices must be made
What is the dose for treating lung?
- curative NSCLS = 6000-7500cGy
- SCLC = 4500-6000cGy
- Boost = 4000-4500cGy
- organ tolerance=2000 cGy
What is the dose for treating the bladder?
45-50 Gy - large pelvic field
15-20 Gy boost fields