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RAD 156 HESI

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show Remove fog or unread images?  
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Calculation is used to determine grid ratio?   show
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3 identifying pieces of information important to include on each digital image?   show
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show This technique produces a 2 milliroentgens (mR) exposure 70 kVp at 31.25 mAs  
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Both limiting spatial resolution (LSR) and modulation transfer function (MTF) measure this.   show
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hospital staff use this to input x-ray orders   show
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show Rescaling  
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How does an increase in noise affect the quality of a digital image?   show
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Which information in the patient history should prompt the radiographer to decide against using automatic exposure controls when taking a chest x-ray? Emphysema. Pneumothorax. Chronic bronchitis. Oat cell carcinoma.   show
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What are recommended uses of the digital annotation tool? 1. Enter technical factors. 2. Label central ray projection. 3. Indicating date or time of the exam. 4. Label right or left side of anatomy. 5. Indicating radiographer performing the exam.   show
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How is signal maximized to a digital image receptor? Shorter exposure time. Longer exposure time. Lower milliamperage (mA) setting. Higher source to image receptor distance (SID) value.   show
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show Low contrast situations.  
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In digital imaging, this is reduced with a longer exposures time (not including motion)   show
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show Increase contrast  
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show Filament circuit.  
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This happens if pixel bit depth is decreased?   show
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How often should lead aprons be evaluated to determine if cracks or holes are present?   show
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Which standard governs communication between the system that contains the patient’s full medical information and the system that has radiology-specific data?   show
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show Emphysema.  
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show Convert alternating current to pulsating direct current.  
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show Increased object-to-image-receptor-distance (OID).  
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This temporarily stores an electric charge?   show
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What is the longest field size dimension allowable for 10 inches by 12 inches collimation at a 40 inch source to image distance (SID)? 10.6 inches. 11.4 inches. 12.8 inches. 13.2 inches.   show
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Which digital post-processing technique results in a black background surrounding the original collimated edges?   show
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The radiographer is using automatic brightness control during fluoroscopy. What change in patient exposure should the radiographer expect as the patient size increases?   show
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Which digital system can store images?   show
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Place these bit depths in order from the one that will produce the least number of grays to the one that will produce the greatest number of grays. 10, 14, 12, 8   show
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show 4, 5  
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A radiographer makes an exposure using an 8:1, 100 line per inch grid. When processing the image plate (IP) through the reader, the radiographer notices that a Moire pattern is seen on the displayed image. What is the probable cause of this artifact?   show
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Automatic exposure control (AEC) is required for PA CXR, the patient has had a right total pneumonectomy. This must be done?   show
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show Decrease in the amount of scatter radiation within the part  
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show Use a 72-inch source-image-receptor-distance (SID).  
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An increase in which factor will improve spatial resolution (not FSS)?   show
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Which is the most likely cause of a histogram error?   show
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Who judges radiographic images for quality? (Select the four that apply.) 1. Quality control technologists. 2. Ordering physicians. 3. Radiographers. 4. Radiologists. 5. Lawyers.   show
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show TRUE  
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show HIS.  
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Which change in technical factors is most likely to result in decreased exposure to the image receptor (IR)?   show
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show Raise exposure factors.  
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show Decrease the exposure time to reduce risk of patient motion  
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show Lower than required milliampere-seconds (mAs).  
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X-ray machines are designed to operate at a specific and continuous supply voltage. Which part of the imaging system is responsible for keeping incoming voltage adjusted to the proper value?   show
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Which action can improve recorded detail (not FSS)?   show
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show Quantity of x-rays.  
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show Increase in spatial resolution.  
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Source of electrons, electrons in high speed motion, and electrons suddenly stop   show
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After the nucleus is excited during the photodisintergration process   show
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The proportion of Compton interactions increases compared to photoelectric interactions   show
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An 85 keV incident photon interacts with an M shell electron with a binding energy of 35 keV. The recoil electron exhibits 29 keV, and the scatter photon exhibits_______   show
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This type of radiation is produced after a Compton interaction   show
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show Any  
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When the mass density of the absorber is _____, it results in ____ Compton scatter   show
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The probability of photoelectric absorption occurring increases with an increase of this   show
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show 0.5  
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These three things affect differential absorption   show
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show photoelectric absorption  
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