OCN Radiation Therapy Nursing

Question 1

What is the primary mechanism by which ionizing radiation destroys cancer cells?

Accepted Answer

Inducing DNA strand breaks that lead to cell death

Answer

Disrupting the cell membrane integrity

Answer

Inhibiting protein synthesis in tumor cells

Answer

Blocking nutrient supply to the tumor

Question 2

Which type of radiation therapy delivers treatment from a source located outside the patient's body?

Accepted Answer

External beam radiation therapy (EBRT)

Answer

Brachytherapy

Answer

Intraoperative radiation therapy

Answer

Radiopharmaceutical therapy

Question 3

A patient undergoing radiation therapy to the chest develops a dry, desquamating skin reaction at the treatment site. What is the most appropriate nursing intervention?

Accepted Answer

Gently cleanse with mild soap and water and apply a recommended moisturizer

Answer

Apply petroleum-based ointment and cover with a dry dressing

Answer

Rub the area vigorously to remove dead skin cells

Answer

Apply an alcohol-based antiseptic to prevent infection

Question 4

What does fractionation in radiation therapy mean?

Accepted Answer

Dividing the total radiation dose into smaller doses given over multiple sessions

Answer

Targeting only a fraction of the tumor volume per treatment

Answer

Using multiple radiation beams from different angles simultaneously

Answer

Delivering radiation in pulses rather than a continuous beam

Question 5

Which radiation therapy technique uses multiple precisely aimed beams to deliver a high dose to a small tumor while minimizing exposure to surrounding healthy tissue?

Accepted Answer

Stereotactic radiosurgery (SRS)

Answer

3D conformal radiation therapy (3D-CRT)

Answer

Intensity-modulated radiation therapy (IMRT)

Answer

Total body irradiation (TBI)

Question 6

What is brachytherapy?

Accepted Answer

Placement of radioactive sources directly inside or adjacent to the tumor

Answer

Radiation delivered by a machine positioned at a long distance from the patient

Answer

A low-dose rate form of external beam radiation

Answer

Targeted radiopharmaceutical therapy given intravenously

Question 7

What is the primary purpose of a radiation therapy simulation appointment?

Accepted Answer

To identify and map the treatment field, verify patient positioning, and create immobilization devices

Answer

To administer the first fraction of radiation

Answer

To perform a biopsy for treatment planning

Answer

To educate the patient about chemotherapy side effects