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DHA Mammography (DHA-MAM) Practice Tests & Test Prep - Topics


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Understanding what is on the DHA Mammography exam is crucial step in preparing for the exam. You will need to have an understanding of the testing domain (topics covered) to be sure you are studing the correct information.

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There is no doubt that this is a strategic step in achieving certification and advancing your career.

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DHA Mammography Exam Blueprint

Understanding the exact breakdown of the DHA Mammography test will help you know what to expect and how to most effectively prepare. The DHA Mammography has multiple-choice questions The exam will be broken down into the sections below:

DHA Mammography Exam Blueprint
Domain Name % Number of
Questions
Patient Care: Education and Assessment 11% 8
Instrumentation and Quality Assurance 23% 16
Anatomy, Physiology, and Pathology 20% 14
Mammographic Technique and Image Evaluation 19% 13
Breast Imaging Procedures 27% 19

DHA Mammography - Exam Topics Sample Questions

The greatest disadvantage of magnification would be considered?

Correct Answer:
increased patient dose


the question revolves around identifying the greatest disadvantage of using magnification in imaging techniques. magnification is a method employed in radiographic imaging to enhance the visibility of small details. although it has its benefits, it comes with several disadvantages, the most significant being an increased patient dose of radiation.

to understand why magnification leads to an increased patient dose, it is essential to explore how magnification works in medical imaging. magnification in imaging is achieved by increasing the object-to-image distance (oid), which is the distance between the object being imaged (e.g., a part of the body) and the image receptor. when the oid is increased, the object appears larger on the image, but this also means that the x-ray beam must travel a greater distance. as the x-rays travel further, there is more opportunity for the x-rays to scatter and spread, resulting in a larger area being exposed and a decrease in the intensity of the radiation reaching the image receptor.

to compensate for the reduced intensity and ensure that the image is still of diagnostic quality, a higher dose of radiation is generally required. this increase in radiation dose is directly proportional to the square of the magnification factor. therefore, with significant magnification, the radiation dose can increase substantially, posing a higher risk of radiation-induced harm to the patient.

another aspect affected by increased oid is the risk of motion unsharpness. with the target being further from the image receptor, even minor movements by the patient can result in noticeable blurring of the image, which can compromise the diagnostic quality of the radiograph. to mitigate this, techniques such as using a smaller focal spot size and applying vigorous compression to the area being imaged are employed. these measures help to maintain image sharpness but can add to patient discomfort.

furthermore, magnification can potentially decrease subject contrast. the increased oid often leads to greater scatter radiation, which can obscure the fine details in the image by reducing the contrast between different tissues. this makes it more challenging to distinguish between subtle differences in tissue density or composition, which are critical in many diagnostic procedures.

in conclusion, while magnification can be a valuable tool in enhancing detail and improving the diagnostic capabilities of radiographic imaging, its greatest disadvantage is the increased patient radiation dose. this is accompanied by other potential drawbacks such as increased risk of motion unsharpness and decreased subject contrast, all of which need to be carefully managed to optimize the benefits of magnification against its risks.

When viewing the digital image on the monitor, the radiologist can refine the image by using all but which of the following?

Correct Answer:
changing contrast
when viewing digital images on a monitor, radiologists have several tools at their disposal to enhance and refine these images for better diagnostic accuracy. the tools commonly used include zooming, changing contrast, and window/leveling adjustments. each of these tools serves a specific purpose in improving the visualization of structures within the image.

**zoom:** this feature allows the radiologist to enlarge a specific area of the image to examine finer details more closely. zooming in can be particularly useful for identifying small abnormalities such as microcalcifications in breast imaging, which might be missed at normal magnification.

**changing contrast:** adjusting the contrast of an image can significantly affect the visibility of soft tissues and structures. by increasing or decreasing the contrast, a radiologist can distinguish between different types of tissues with similar densities, which is crucial in areas like mammography where the contrast between normal and pathological tissues can be subtle.

**window/leveling:** this adjustment changes the brightness and contrast of the image but is applied in a way that can highlight specific ranges of grey levels within the image. this is particularly useful in differentiating between tissues of slightly varying densities and can help in identifying edges of tumors or lesions more clearly.

however, "inverting the image," which refers to reversing the grayscale of the image (turning light areas dark and vice versa), is not typically used to refine images for better diagnostic interpretation in the context of radiology, especially in mammography. while inversion might be used for specific purposes in other imaging modalities or settings, it does not generally enhance the diagnostic quality of breast images. in breast imaging, the standard grayscale presentation is usually most effective for identifying the nuances in tissue density crucial for accurate diagnosis. therefore, inverting the image is not a standard refinement technique used by radiologists for enhancing the diagnostic quality of breast images on digital monitors.