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21 Cards in this Set
- Front
- Back
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also known as output,the amount of radiation exposure produced by a treatment machine or source as a specified at a reference field size and at a specified reference distance
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dose rate
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a plot of target or normal structure volume as a function of dose. it is, in essence, a frequency distribution of the number of target or normal-structure voxels receiving a certain dose. in its most common form, it is a plot of volume versus the minimum dose absorbed within that volume
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dose-volume histogram (DVH)
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radiation therapy practitioner responsible for production of the patient's treatment plan and any associated quality assurance component
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dosimetrist
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secondary tumors that occur via the cerebrospinal fluid
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drop metastases
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teh residula remains of airborne pathogens after teh evaporation of moisture
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droplet nuclei
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any substance that alters physiologic function, with the potential for affecting health
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drug
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the mutual or reciprocal action or influence between drugs and/or food that can create positive or negative effects in the body
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drug interactions
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the use of a moving collimator jaw to produce a wedged field
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dynamic wedge
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difficulty in swallowing. the sensation of food sticking in the throat
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dysphagia
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double vision
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dysplopia
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difficult, labored or uncomfortable breathing
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dyspnea
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external auditory meatus
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EAM
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the escape of blood into the tissues, causing large blotchy areas of discoloration
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ecchymoses
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excessive accumulation of fluid in tissue, producing swelling
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edema
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the dose equivalent weighted by the proportionate risk for various tissues. that is, it is the sum over specified tissues of he products of the dose equivalent in a tissue and the weighting factor for that tissue
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effective dose equivalent
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another term for blocked field size (BFS). this is the equivalent rectangular field dimensions of the open or treated area within the collimator field dimensions. the effective field size is the actual area treated
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Effective field size (EFS)
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lymphatic vessels that flow out of the hilum of a lymph node
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efferent lymphatic vessels
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the total time over which treatment is delivered (protracted)
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elapsed days
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a measure of how strongly the particle is attracted to an electrical field and can be either positive or negative
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electrical charge
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an instrument for directing a high-frequency current through a local tissue area
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electrocautery
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product of the absorbed dose and a quality factors (QF), which takes into account the biologic effects of different types of radiation on humans; units are the rem (1 rem=1 rad x QF) or sievert (1Sv = Gy x QF). 1Sv=100rem
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dose equivalent
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