Radiography
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| Area on anode of transferring sufficient energy to an atom so that the outer electron is removed; the atom becomes positively charged. | Actual Focal Spot
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| Waves are transmitted to deeper tissue; none are reflected back. | Anechoic
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| Loss of intensity of the ultrasound beam as it travels through tissue, caused by absorption of scatter. | Attenuation
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| Ability to differentiate between two reflecting interfaces that lie along the axis of the transmitted sound beam. | Axial Resolution
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| A particle ray consisting of a fast electron who's mass is nearly 1/2000 of the mass of a proton or neuron. | Beta Ray
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| Is a major class of integral circuits used similar to CCD technology in digital radiography. | Complimentary Metal-oxide Semiconductor (CMOS)
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| Mode of alternative imaging in which the patient moves through a circular gantry. | Computed Tomography (CT)
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| Substances used to opacity or delineate an organ system against the surrounding organs. | Contrast Media
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| Has a well defined border with no internal echoes and shows posterior enhancement. | Cystic Lesion
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| Processing chemical that changes the sensitized silver halide crystals into black metallic silver. | Developer
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| Tissue that produces enough echoes when it is returned to the transducer and displayed. | Echoic
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| When current is applied to the cathode filament. | Electron Cloud
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| Process by which an electron is moved to a higher energy level within the atom. | Excitation
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| Coiled wire of the cathode that emits the electron beam. | Filament
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| Processing chemical responsible for removing the remaining silver halide crystals from the film emulsion. | Fixer
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| Device used to restrict the size of the x-ray beam. | Collimation
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| Images taken in constant real time. | Fluoroscopy
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| Distance from the focal spot to the recording surface. | Focal Film Distance (FFD)
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| Part of the cathode that restricts the diameter of accelerating electrons to the focal spot on the anode. | Focusing Cup
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| Radiographic effect occuring when the object is not parallel to the recording surface. This causes distortion of the size and length of the object. | Foreshortening
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| Number of complete waveforms (cycles) per unit of time. | Frequency
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| Series of thin linear strips made of alternating radiopaque and radiolucent interspaces. | Grid
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| Owing to the angle of the target, a greater intensity of x-rays is emitted from the cathode side, rather than from the anode side. | Heel Effect
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| Describes tissues that reflect more sound back to the transducer. These tissues appear brighter than surrounding tissues. | Hyperechoic
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| Describes tissues that reflect less sound back to the transducer. These tissues appear darker than surrounding tissues. | Hypoechoic
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| Process of transferring sufficient energy to the atom so that the outer electron is removed; The atom becomes positively charghed. | Ionization
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| Describes tissues that have the same echotexture as surrounding tissues. | Isoechoic
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| Also refered to as an excretory urogram. | Intravenous Pyelogram
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| Device that produces a rectangule-shaped image; Useful when imaging areas with an unrestricted acoustic window. (e.g. equine tendons) | Linear Scatter
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| Type of alternative imaging in which the patient is placed in a magnetic field and radiofrequency signals are transmitted, received and constructed into detailed cross-sectional images. | Magnetic Resonance Imaging (MRI)
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| A substance that is low in atomin number and appears radiolucent in the radiograph. | Negative Contrast
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| A branch of medical imaging that uses unsealed radioactive substances in diagnosis and therapy. | Nuclear Medicine
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| Type of noninvasive imaging procedure that uses radioactive material to obtain an image. | Nuclear Scintigraphy
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| Conversion of electrical energy to ultrasound. | Peizoelectric Effect
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| Loss of detail due to geometric unsharpness. | Penumbra
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| A diagnostic imaging technique used to generate pictures of the patients biological functions, and the metabolic changes of the cells in the body. | Photon Emission Tomography (PET)
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| A substance high in atomic number that appears radiopaque on the radiograph. | Positive Contrast
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| A device that sets the grid in motion, blurring the white lines on the finished radiograph that are produced by the grid. | Potter-bucky Diaphragm
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| Term referring to the average energy of the x-ray beam or its penetrating ability (kVp). | Quality
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| Bundle of radiation energy. | Quanta
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| Term that refers to the total numbers of x-ray photons (controlled by mA). | Quantity
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| Loss of radiographic detail that occurs in faster screens because of the uneven distribution of the phosphor crystals within the screens. | Quantum Mottle
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| Object or tissue that absorbs radiation so that the image on the film is lighter. | Radiodense
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| How well the shadows on the radiograph are clearly identified. | Radiographic Quality
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| Radioactive material. | Radionucleotide
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| Process of changing alternating current to current flowing in one direction only (Direct current). | Rectification
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| Primary radiation emitted from the x-ray tube. | Remnant Beam
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| Unit of measurement of the absorbed dose of ionizing radiation. | Roentgen-Equivalent-Man (REM)
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| Caused by interaction of the primary beam with tissue or matter in its path. | Secondary Radiation
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| A device that produces a pie-shaped image with a narrow near field and a wide far field; Useful when imaging areas with a restricted acoustic window (e.g. intercostals). | Sector Scanner
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| The unit of radiation dose equivalent to the absorbed dose in tissue. | Sievert (Sv)
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| Describes the tissue that transmits most of the sound to deeper tissues, with only a few waves being reflected back to the transducer; Appears dark on the monitor. | Sonolucent
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| Part of the x-ray tube that consists of a block of tungsten embedded into a block of copper on the anode side of the tube. | Stationary Anode
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| Loss of radiographic detail that occurs because of phosphor variations found in intensifying screens; More noticeable with fast-speed screens. | Structure Mottle
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| Resulting from the difference in density, mass and atomic number of adjacent tissue structures. | Subject Contrast
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| Device that personnel wear to indicate dosage of radiation exposure. | Thermoluminescent Dosimeter
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| Series of controls on an ultrasound machine that are used to make the like tissues look the same. | Time Gain Compensation
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| Situation in which the positive potential (voltage) between the cathode and anode is insufficient to pull all electrons across the tube. Extra electrons build up on the glass envelope, causing it to crack. | Tube Saturation
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| The speed at which sound travels through a medium. | Velocity
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| Distance of one complete waveform. With ultrasound, it is the distance from one band of compression or rarefaction to the next. | Wavelength
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