Image chapter 7 & HW
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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show | OID
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show | subject anatomy is inclined
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Distortion can be corrected by | show 🗑
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show | Reduce OID
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Distortion of an x-ray image results from unequal | show 🗑
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In magnification radiography, when the subject is placed equidistant between the source and the image receptor, the size of the image will be | show 🗑
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show | subject contrast will remain unchanged and the magnification factor will remain unchanged
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To obtain minimum magnification, one should do what | show 🗑
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What condition contributes the least to image distrotion | show 🗑
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show | Position the object as close to the image receptor as is practical
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show | results from an inclined object
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show | Shorter OID
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What is not one of the factors of the geometric factors that affect radiographic quality | show 🗑
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The magnification factor is not dependent on | show 🗑
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The magnification factor increases with increasing what | show 🗑
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show | Postioning the anode the same side as the chest wall
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What is most responsible for radiographic spatial resolution | show 🗑
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The sharpness of detail in a radiograph is best increased by the use of what | show 🗑
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show | Sharp in detail
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show | minimize the FSB of the kidneys
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Geometric blur is controlled prinicipally by what image system characteristic | show 🗑
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show | Small focal spot
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Another term for FSB is | show 🗑
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When one images an object lateral to the central axis of the x-ray beam the FSB will be | show 🗑
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Increasing what is effective in reducing FSB | show 🗑
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When the focal spot is switched from larger to small | show 🗑
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show | Reducing OID
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show | Subject contrat
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Spatial resolutiuon is principally affected by waht | show 🗑
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show | Increase SID
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show | Increasing SID and reducing OID
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Focal spot blur can be reduced by what | show 🗑
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show | Average energy of the x-ray beam
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Ensuring good screen film contact also encures reduced | show 🗑
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show | contrast resolution
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show | contrast resolution and patient dose
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What is most often influenced by focal spot size | show 🗑
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show | 70kVp/200mAs
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show | kVp
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show | Better spatial resolution
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If the other factors remain constant what would have the highest optical density | show 🗑
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An anteroposterior examination of the abdomen is taken at 80kVp, 50mAs, and 100cm SID. If the scale of contrast is to be shortened the radiologic technologist must do what | show 🗑
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show | 80ms
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When radiographic technique factors are adjusted to obtain an acceptable image, patient dose will increase as what increases | show 🗑
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show | reducing focal spot size
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show | Slow radiographic intensifying screens( compared with fast screens
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With other factors staying the same optical density will increase with increasing | show 🗑
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Radiograhic contrast is increased by what | show 🗑
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show | Motion blur is reduced if the same mA is used
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The sharpness of structural lines or minute details on the radiograph is | show 🗑
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show | Visibilty of Detail
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These are the factors that can be measureed | show 🗑
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What are the 4 factors of the x-ray beam | show 🗑
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show | visibilty of detail and geometric detail
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show | reduce it
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increasing the screen speed will have what effect on detail | show 🗑
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decreasing collimation will have what effect on detail | show 🗑
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Increasing the motion has what effect on detail | show 🗑
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What are the 4 ways to reduce motion | show 🗑
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show | communication
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What are the two properties of geomteric detail | show 🗑
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image proper or true image is | show 🗑
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the light hazy area surrounding the true image | show 🗑
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show | SID, OID and FSS
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show | Long SID, Sort OID, and Small FSS
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increasing the SID ____ penumbra and _____ detail | show 🗑
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Increasing the OID____ penumbra and _____ detail | show 🗑
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Increasing the FSS ___ penumbra and _____ detail | show 🗑
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When do we use a long SID and why | show 🗑
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show | increase the SID to compensate for the increase in OID
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show | Extremity work
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What whappens to the focal spot as mA is increased | show 🗑
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show | >0.3mm
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What do we use to measure a focal spot size of a Star Pattern | show 🗑
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show | line focus principle
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show | it gives us the heat capacity of a large focal spot and the geometric sharpness of a small focal spot
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show | effective focal spot
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the area bombarded by the electrons(at anode;target;in the tube) | show 🗑
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Which focal spot is the largest | show 🗑
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show | 5 to 15 degrees
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show | smaller
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The best radiograph having the most detail will have | show 🗑
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show | line pair test
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What does SOD mean | show 🗑
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show | width of the focus x OID/ SOD
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show | the smaller number
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misrepresentation of the true size and or shape of the object | show 🗑
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show | size and shape
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what is the true distortion | show 🗑
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show | shape
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misrepresentation of the true size of an object | show 🗑
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The width of the image is to the width of the object as the distance of the image from the light source is to the distance of the object from the light source | show 🗑
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The longer the SID the____ the magnification; the shorter the OID the____ the magnifiaction | show 🗑
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What is the formula for law of magnification | show 🗑
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If you increase the OID for certian reasons what should you do to SID and why | show 🗑
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The misrepresentation of the shape of an object | show 🗑
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what is shape distortion caused by | show 🗑
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show | poorer
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What is the Ideal object film and tube postion | show 🗑
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The image is shorter than the object | show 🗑
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the image is longer than the object | show 🗑
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what is foreshortening caused by | show 🗑
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show | the tube being angled
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