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J301 IUN

Specific Radiotherapy Terns

QuestionAnswer
What is a particular radiation therapy technique in which an external beam of radiation is moved 180-360 degrees? Arc Therapy
The term referring to the insert of a block of material between the radiation and the patient to alter the shape of the radiation beam and spare healthy tissue? Beam Shaping
Radiation therapy that is carried out at a short distance with either beta or gamma radiation. This type of therapy is carried out by the implantation or placement of needles, tubes, or catheters. Brachytherapy
Bolus is a material that has the same density as tissues. Compensators are used to put inside the machine, does the same things as a bolus. Bolus
A device that is attached to the head of the treatment machine and consists of an arm that passes around the patient to the opposite side of the body. A pointer which is attached to the area is aligned exactly along the central axis of the radiation beam. Back Pointer
The part of the radiation which is scattered back toward the suface in the patient. Backscatter
The actual radiation that comes out of the machine into the patient. Beam
A general term for uncontrolled/abnormal growth of malignant cells. Cancer
A new epithelial growth leading to infiltrate and gives rise to metastasis. Can happen in any part of the body where you find epithelial tissues. Carcinoma
A material of known density that is shaped so as to compensate for the irregularities in a patient's contour. This device can be placed in the path of the radiation beam to produce a homogeneous distribution of dose to make the skin level even. Compensator
An outline of the part of the patient's body to be treated, which is obtained with plaster or wire, and transferred to paper for a permanent record. Its done along central axis. Contour
Central Axis, a part in space that the machine rotates around, part you will be treated. CA
Part of linear accelerator that limits the radiation exposure. Collimator
Measurement of the amount of radiation dose absorbed by the body, prescribed. Centigray (cGy)
To successfully treat a patient so as to eradicate the disease and leave the patient with being disease free. Cure
How much radiation planning in the treated area. Dose Distribution
Center of tumor, point where the maximum dose from a single beam occurs in tissue. Dmax
One of the qualified members of the radiation physics team who is responsible for developing the best treatment so as to encompass the volume to be treated and to see that the prescribed dose is delivered. Dosimetrist
Device that measures the amount of radiation. Dosimeter
Spreading of the beam as distance from the source increases. Divergence
A skin reaction that occurs whithin a treatment portal marked by redness. Erythema
Point at which radiation enters the body. Entrance port
The dose delivered to the skin surface directly opposite from the entrance portal of the radiation beam. It is important when opposing beams are used because overdosage can occur. Exit Dose
The area of exit of the radiation beam which is directly opposite the entrance port. Exit Port
Amount of radiation that produces a specific amount of ionization in the air via Exposure Roentgen
Dimensions of the area that is to be treated. Field size is based on two criteria: the size must be large enough to cover the treatment area. Field size
The process by which the total dosage of radiation is divided evenly. Fractionation
A device that is attached to the head of the treatment machine consisting of a rod that aligns along the central axis. Front Pointer
Rotating part of linear accelerator that enables delivery of radiation at different angles. Gantry
The thickness of an absorbing material required to reduce the dose to half the original value. Half Value Layer
An area of very high dose that occurs when the high dose regions from 2 ports overlap Hot spot or cold spot
The placement of a radioactive material in tissue for a therapeutic purpose. An implant may be seeds, catheters, tubes, etc. Implant
A particular piece of equipment used to render a particular treatment area motionless or to secure a patient to the table, so he/she does not move during the therapy treatment. Immobilization device
A graphic representation of a radiation dose distribution in an absorbing medium with lines drawn through points having an equal percentage of dose at a certain depth. The isodose curve varies for different emerges. Isodose curve
Image modulated radiation therapy that improved precision/accuracy in treatment dividing each field into multiple segments. IMRT
The distribution of more dose of radiation through one treatment port than through another. Loading (field weighting)
A light tight package of photographic film worn like a badge that is used to measure any possible exposure to ionizing radiation. The dose that is absorbed can be determined by the degree of film darkening caused by the radiation. Monitoring device
Mega electron voltage MeV
Therapy treatment machine which produces very high energy x-rays from 2 MeV upwards. Megavoltage treatment units
Amount of radiation patient gets per field. Monitor Unit
Multi leaf collimator that reduces the use of blocks. MLC
The appearance of a secondary site of malignancy that has spread from the primary site. Metastasis
A new and abnormal growth of tissue that serves no useful purpose can be benign or malignant. Neoplasm
A dose delivered per unit time by a treatment unit at given distance and a given field size. Output
Branch of medicine dealing with the study of a neoplasm. Oncology
The use of ionizing radiation to alleviate or ease symptoms such as pain. Palliation
The region at the edge of the field where the radiation falls off. Penumbra
Defines the dose ata given depth below the skin surface Percentage Depth Dose
A radiograph taken of the treatment field with the patient in the proper treatment position, at 90 degrees (AP/Lateral) Port Film
Amount of absorbed dose, the amount the patient receives. Radiation Dose
Radiation absorbed dose RAD
Radiation absobed in air. Roentgen
The ability of cells, tissues, organs or organisms to resist radiation. Radioresistance
The treatment using ionizing radiation to cure Radical Radiation Therapy
A visible effect or symptom related to the treatment. Radiation Reaction
The treatment of malignant disease by means of ionizing radiation. Radiation Therapy
The dose that is delivered at a given depth below the skin's surface usually along the central axis of the radiation beam. Relative Depth Dose
Cures the radiation. Radiocurability
The effect of radiation on living things. Radiobiology
The susceptibility and responsiveness of cells, tissues and organs to ionizing radiation. Radiosensitivity
The breaking up of a course of radiation therapy into many parts. Split Dose Technique
The distance from the source or target to the axis of radiation, from the gantry to the inside of the patient. SAD
Source to skin distance SSD
Refers to the ability of high energy radiation to have their maximum effect below the skin surface. Skin surface
Instructions on how the patient is set up from the SIM. Set-up
Therapy treatment machines which produce soft x-rays, close to the surface of the skin. Superficial treatment
A diagnostic x-ray machine that is constructed to simulate the geometry of a particular treatment machine. Simulator
A malignant neoplasm of non-epithelial tissue origin such as connective tissue. Sarcoma
The treatment of malignant disease with radiation from an extended distance. Teletherapy
A new growth of tissue that serves no useful function but grows at accelerated rate. Tumor
The procedures, either clinical examination or radiographic examination, that are necessary to identify the exact location of the tumor. Tumor Localization
A radiograph which is exposed during the treatment. Verification Film
A form of radiation that can be used either at low levels to produce an image of the body on film or high levels to treat neoplasms. X-ray
Created by: 515933944