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RAD177 HESI
HESI Image Production V2
| Question | Answer |
|---|---|
| A step up transformer with 300 turns in the primary coil is supplied with 220 volts to this primary. How many secondary turns are needed to produce a 66,000 volt output? | 90,000 turns |
| What best defines a histogram? | Graph where the x-axis is the amount of exposure read, and the y-axis is the number of pixels. |
| At a 50 in SID, how closely must the x-ray beam and the light field be aligned? | 1 inch |
| Which computed radiography (CR) or digital radiography (DR) system produces images with the highest spatial resolution? | Amorphous selenium - direct capture DR |
| How much compensation is needed for a change to a small focal spot? | None |
| What is the result if the total lead content of a grid is decreased? | Decreased scatter absorption |
| Which will increase the appearance of noise in a digital image, assuming only the named factor in each response is changed? | Large matrix |
| An imaging department, having difficulty obtaining acceptable tangential patella images, has opted to have the post processing mode set to “fixed” for all patella images. Why is this a good choice? | Fixed mode works well for exams where it is difficult to center the image on the IR |
| In which way can the radiographer minimize motion due to peristalsis? | Decrease exposure time |
| What is a method of electronic display resolution quality control testing? | Society of motion Picture and Television Engineers (SMPTE) test pattern |
| If all the Bucky digital images from one radiographic room seem to appear excessively noisy, what might the radiographer suspect? | The AEC is set at an inappropriate speed class. |
| If a radiographer wanted to double image density without doubling the patient’s dose, which action should be taken? | Increase kVp by 15% |
| Which factor will increase x-ray beam quantity at the IR without increasing heat units produced by the tube? | Decreased filtration |
| Which is one function of a picture archiving communication system (PACS) network? | Downloading images from different imaging modalities. |
| Which is the preferred method for indicating the correct anatomic side on a radiographic image? | Place a side marker directly on the IR prior to exposure |
| Which advantage does a 500 mA station have over a 200 mA station? | Increased photon flux to the IR |
| In conventional tomography, the radiographer is able to control the thickness of the tomographic slice by altering which of the following? | Exposure angle |
| How does a radiographer maximize signal to digital image receptors? (Select 3) | Longer exposure time Compression of the body part Shorter SID |
| Assuming other exposure factors remain the same, which SID causes the greatest reduction in x-ray quantity at the IR? | 72 inches |
| Which best describes anode heel effect? | A phenomenon where x-ray intensity is greater under the cathode |
| Determine the file size for an image with a 512x512 matrix and 12 gray scale bit depth. | 393,216 bytes. (Matrix size x bit depth / 8) (512x512x12/8) |
| Digital radiography has the ability to produce 16,000 shades of gray. What appropriate bit depth (dynamic range) does this represent? | 14 bit depth |
| What could cause a computed radiography image with very noticeable lines uniformly in the same direction over the entire image? | Noise resulting from plate reader electronics Grid used with grid frequency equal to the image reader’s laser scan lines. Grid utilized with grid lines running parallel to the laser scan lines of the image reader device. |
| Which pathologic condition will result in the greatest attenuation of the beam? | Ascites |
| Historically, rhenium was alloyed to the tungsten in the filament of valve tubes to increase electron emission. What is the major reason this isn’t used in x-ray tube filaments? | To permit fine control of electron emission by filament heating current. |
| A radiographer is performing a portable abdomen using an IR with an 8:1 grid. The radiographer knows a technique for the abdomen using a 12:1 grid is 80kVp using 50mAs. Which would the new technique be in order to maintain image quality? | 80 kVp @ 40 mAs |
| How does emphysema impact radiographic imaging of the chest? | Emphysema is a destructive disease, meaning the chest tissue is more radiolucent. |
| Which component of radiographic noise in digital imaging is controlled by the radiographer? | Quantum mottle |
| What results from utilizing a lower ratio grid? | Lower contrast, but greater error margin in CR placement. |
| How can the contrast scale be modified on a digital image? | Collimate more closely Alter the window width |
| Which function are Radiology information system (RIS) networks are capable of performing? | Tracking radiology scheduling information. |
| Which material is used on most anode disks and is light, strong, and heat-resistant? | Molybdenum |
| Which term refers to unwanted fluctuations in the brightness of an image? | Noise |
| Why is it important for the rad to observe the mAs readout at the end of each exposure when using AEC? | This value may be used as a basis for calculating manual techniques. |
| Place the following mAs selection in order from which will cause the greatest exposure to the IR to the least exposure, if all other factors remain the same. 25, 50, 100, 200. | 200, 100, 50, 25 |
| Which component of a diagnostic x-ray tube restricts the primary beam to the area of interest? | Collimator |
| What is the purpose of shuttering? | To black out areas of light and make fine details more visible. |
| Which term refers to the process by which digital radiography (DR) systems adjust for exposure errors so that the image is displayed with proper brightness and contrast levels? | Automatic rescaling |
| Which factor would the radiographer choose to maximize recorded detail in the image? | Small focal spot |
| Pelvis routine calls for an AP with perp CR and an axial with 40 cephalic angle. Using a caliper measurement, the technique chart yields a perfect set of exposure factors for the perp AP. How would you change the exposure factors for axial? | Greater measurement, higher kVp and mAs |
| If computed radiography (CR) imaging plates haven’t been used, how often should they be erased? | 48 hours |
| In order to increase the number of shades of gray displayed on a digital image, what should be done? | Increase the window width |
| If a transformer has a greater number of turns in the secondary coil than the primary coil, how will the output voltage be affected? | Increased |
| Which statement is correct regarding the relationship of patient dose to exposure index (EI)? | EI gives an approximation of patient’s dose. |
| A breathing technique is planned for a RAO sternum. The intended exposure is 50 mAs @ 75 kVp @ 100cm SID. Which mA station is preferred, assuming the radiographer ensures exposure occurs during the act of inspiration? | 50 |
| Computed radiography (CR) imaging creates images with poorer resolution than that of film screen. What compensates for this loss of resolution? | The wide latitude |
| If 7 mAs provides optimal density without a grid, which mAs should be used with a 12:1 grid? | 35 |
| Which type of exposure technique chart would allow the radiographer to make small, fine adjustments for orthopedic work? | Variable kVp |
| A finished radiograph has marked quantum mottle. Positioning, collimation, and identification markers are correct. Which action should the rad take? | Repeat the image with an appropriate increase in technical factors. |
| What would a continuous, fine, horizontal white line across the CR image indicate? | Dirt on the light guide |
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