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Physics HW U4
| Question | Answer |
|---|---|
| In a modern fluoroscope, the fluoroscopic x-ray tube: | can be under or over the table |
| The fluoroscope was invented by: | Thomas Edison |
| Compared with a radiographic examination, the primary purpose of the fluoroscopic examination is to visualize: | Dynamic images |
| Fluoroscopy normally requires a tube current of: | 1 to 5 mA |
| Compared with a radiography, the x-ray technique required for fluoroscopy calls for which of the following? | lower mA |
| Automatic brightness stablization(ABS) is designed to compensate for changes in which of the following? | Patient composition and Patient positioning |
| The Bucky slot cover of a fluoroscope is a: | Protective device |
| Which of the following structures is the most sensitive to color? | Cones |
| What is the function of the iris? | Control the light level |
| The cones are: | Very sensitive to light |
| The fovea centralis is: | Part of the retina |
| Visual acuity is the ability to do which of the following? | Perceive fine detail |
| The rods are used principally for which of the following? | Dim vision |
| In general, during fluoroscopy as compared with radiography: | the mA is lower |
| Which of the following describes the fluoroscopic systm designed to maintain constant image intensity? | Automatic brightness stablization(ABS) |
| Which of the following structures is responsible for the vision of dim objects? | Rod |
| Which of the following ocular structures immediately precedes the vitreous humor along the path of incident light? | Lens |
| Which of the following properties is associated with rods but not with cone? | scotopic vision |
| Phototelectric emission: | Is the emission of electrons from an illuminated surface |
| At what stage of image-intensified fluoroscopy is the number of image-forming photons lowest? | entering the input phospher |
| image-intensifer brightness gain increases with increasing: | flux gain |
| When an image intensifer recieves x-rays at the input phospher, what is emitted at the output phospher? | Visible light |
| which of the following is the input phospher of image intensifers? | Cesium iodide |
| Which of the following is the output phospher of image intensifers? | Zinc cadmium sulfide |
| The photocathode converts: | Visible light into electrons |
| Which of the folowing is the component of the image intensifer responsible for focusing the electron beam? | Electrostatic lens |
| The ability of an image intensifer to enhance image illumination called | Brightness gain |
| The minification gain of an image intensifer increases with increasing: | input phospher size |
| Which of the following is a representive brightness gain for an image intensifer? | 200 |
| If an image intensifer is described as a 25/12 tube , 25/12 refers to which of the following? | diameter of the input phospher in cm |
| An image that displays vigentting: | is deam around the periphery |
| With multifocus image intensifer in magnification mode: | Spatial resolution is improved |
| In a 10/7/5 image intensifier: | the field of view is largest in the 10 mode |
| Place the following in proper sequence for image intensified fluoroscopy:1. electric signal to light 2. electrons to light 3. light to electric signal 4. light to electrons 5. x-ray to light | 5,4,2,3,1 |
| Which of the following applies to the output of phospher? | light emitted |
| Vertical television resolution is limited principally by which of the following? | lines per frame |
| The electron beam in a television camera tube is produced by which of the following means? | Thermionic emission |
| What is the cinefluorography component of image intensifer fluoroscopy? | Synchronized |
| What is the photoemissive component of image intensified fluoroscopy? | electrons from light |
| Which of the following is photoconductive? | Target |
| What is the principle disadvantage of coupling the television camera to the image intensifier with the use of fiber optics? | photospot camera cannot be used |
| Which of the following refers to the image intensifier input phospher? | cesium iodide |
| Which is a critical component in optically coupling an image intensifer with a photospot camera? | objective lens |
| What is the most important component of a television monitor? | cathode ray tube |
| In an optical coupling arrangement, which is nearest the television camera? | camera lens |
| What is the component of the television monitor in which the video signal is transformed into an image? | phospher screens |
| What is the electron beam of the television camera tube? | collimated |
| One television frame is equivalent to which of the following? | two television fields |
| Fluoroscopic television operates at a frame rate of | 30/fs |
| Horizontal television resolution is limited principally by which of the following? | bandpass |
| what is normally the weakest imaging link in television fluoroscopy? | television monitor |
| Common frame rates during cinefluorography are 15, 30, and 60 fs because | Of thefrequency of the of power supply |
| When the electron beam of the CRT is blanked, it is? | in a vertical retrace |
| Which of the following is true about cineradiography? | The x-ray beam is off when the shutter is closed, as a patient protection measure |
| What is the television camera tube components of image intensified fluoroscopy? | Vidicon |
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