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DHA Computed Tomography (DHA-CT) Practice Tests & Test Prep - Topics


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Understanding what is on the DHA Computed Tomography 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.

  • Directs your study efforts toward the most relevant areas.
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  • Aligns your preparation with the exam's expectations.
  • Increases the likelihood of success.
  • Keeps you informed about your field's current demands and standards.
There is no doubt that this is a strategic step in achieving certification and advancing your career.

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DHA Computed Tomography Exam Blueprint

Understanding the exact breakdown of the DHA Computed Tomography test will help you know what to expect and how to most effectively prepare. The DHA Computed Tomography has 70 multiple-choice questions The exam will be broken down into the sections below:

DHA Computed Tomography Exam Blueprint
Domain Name % Number of
Questions
Patient Care and Safety 17% 12
Image Procedures 50% 35
Physics and Instrumentation 33% 23

DHA Computed Tomography - Exam Topics Sample Questions

How are pixels arranged?

Correct Answer:
both a and b


pixel, short for "picture element," is the fundamental unit of a digital image displayed on screens such as televisions, monitors, and smartphones. pixels are the smallest addressable element in a display device, and they are crucial in defining the resolution and quality of an image.

pixels are typically arranged in a grid-like structure composed of rows and columns. this systematic arrangement allows for the precise control and manipulation of each pixel to display images or videos. each pixel in the grid can be controlled individually or in groups, and the color and brightness of each pixel can be adjusted according to the data provided by the input source, such as a computer or a camera.

the arrangement of pixels in rows and columns is essential for creating a cohesive and clear image. when pixels are placed close together, they can blend smoothly to display continuous-tone images that appear natural to the human eye. the proximity of pixels is particularly important in higher resolution displays, where the pixel density is greater, allowing for sharper and more detailed images.

furthermore, the number of bits per pixel, often referred to as color depth, plays a significant role in the quality of the image. the bits per pixel determine how many different colors each pixel can represent. a higher number of bits per pixel allows for more colors and finer gradations between colors, which contributes to more realistic and vibrant images. for instance, an 8-bit per pixel setting can display 256 different colors, whereas a 24-bit setting can display over 16 million colors.

while pixels are typically organized in rows and columns, other arrangements are less common and usually specific to certain types of technology. for example, some displays might use a hexagonal or circular pixel arrangement to achieve various visual effects or improve viewing angles. however, the standard remains the grid layout due to its efficiency and compatibility with most digital image processing techniques.

in summary, the arrangement of pixels in rows and columns is a fundamental aspect of modern digital displays, affecting everything from image clarity to color reproduction. the close placement of pixels and the number of bits per pixel are critical factors in determining the overall quality of the visual display. understanding these elements is key to appreciating how digital images are created and manipulated to produce the final visual output on various electronic devices.

As a part of assessing/monitoring vital signs before performing a CT scan, a patient’s pulse must be taken. If the patient’s pulse is taken at the top of the foot, what artery is being used?

Correct Answer:
dorsalis pedis
to answer the question about which artery is used when a patient's pulse is taken at the top of the foot, the correct artery is the dorsalis pedis artery. here’s an expanded explanation:

the human body has several arteries that are commonly used for monitoring the pulse. these include the brachial artery, femoral artery, popliteal artery, and dorsalis pedis artery, among others. the location where the pulse is measured often depends on the situation and the patient’s condition.

the brachial artery is found on the medial side of the elbow cavity, which is the inner area of the elbow. it lies between the biceps and triceps muscles. this artery is commonly used for measuring blood pressure using a cuff.

the femoral artery is located in the groin area. it is a major artery supplying blood to the lower limb, and it is palpable in the groin area, making it accessible for checking the pulse, especially in cases of trauma or cardiac arrest.

the popliteal artery is situated behind the knee. it is a continuation of the femoral artery as it passes through the thigh and behind the knee. the pulse here can be felt in the popliteal fossa, the shallow depression located at the back of the knee joint.

the dorsalis pedis artery, which is the focus of the question, is found on the top of the foot. it is a continuation of the anterior tibial artery that runs down the front of the leg and onto the foot. the pulse of the dorsalis pedis artery can be palpated in the area between the first and second metatarsal bones of the foot.

therefore, when a patient's pulse is taken at the top of the foot, the artery being used is the dorsalis pedis artery. this location is particularly useful for checking circulation to the lower extremities, especially in medical assessments that require an evaluation of peripheral arterial disease or in any situation where other more proximal pulse points are not accessible.