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DOH Computed Tomography - Reviews


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Based on 200 reviews

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See why our users from 154 countries love us for their exam prep! Including 200 reviews for the DOH CT exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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DOH Computed Tomography - Test Reviews Sample Questions

If a CT image has a DFOV of 250 mm and a pixel area of 0.5 mm, which of the following matrix sizes would be considered correct?

Correct Answer:
512 x 512
to determine the correct matrix size for a ct image with a given display field of view (dfov) and pixel area, we first need to understand the relationship between these parameters and the matrix size. here's a step-by-step breakdown:

**understanding dfov and pixel dimensions**: - **dfov (display field of view)**: this is the diameter of the circular region of the patient that is displayed in the image. in this case, the dfov is 250 mm. - **pixel area**: this is the area of each square pixel in the image. here, the pixel area is given as 0.5 mm. since the area of a square is the side length squared, the side length (or pixel dimension) is the square root of the pixel area. thus, the pixel dimension is √0.5 mm ≈ 0.707 mm.

**calculating the matrix size**: - the matrix size in terms of the number of pixels in each dimension (width and height) can be calculated by dividing the dfov by the pixel dimension. - calculation: matrix size = dfov / pixel dimension = 250 mm / 0.707 mm ≈ 353.5 - since matrix sizes are typically given in whole numbers and standard values (like 128, 256, 512, etc.), we round 353.5 to the nearest standard matrix size. here, the closest standard matrix size would be 512 (as it is a common matrix size in ct imaging).

**conclusion**: given the calculations and common practice in ct imaging, a matrix size of 512 x 512 would be the correct choice for a ct image with a dfov of 250 mm and a pixel area of 0.5 mm^2. this matrix size would adequately cover the dfov while maintaining the resolution specified by the pixel dimension. other sizes like 125 x 125 or 250 x 250 would either not fully utilize the available resolution or would not cover the dfov adequately.

As a part of assessing/monitoring vital signs before performing a CT scan, a patient’s pulse should be taken. If the patient’s pulse is taken along the anterior aspect of the neck, to the right or left of midline, what artery is being used?

Correct Answer:
carotid
when assessing a patient’s pulse in the context of preparing for a ct scan, it is crucial to accurately locate the appropriate artery for palpation. the question specifically asks about taking the pulse along the anterior aspect of the neck, to the right or left of midline. in this location, the artery palpated is the carotid artery.

the carotid artery is a major blood vessel that supplies oxygenated blood to the brain, neck, and face. it is located on both sides of the neck, and it bifurcates into the internal carotid artery and the external carotid artery at the level of the upper border of the thyroid cartilage. the significance of using the carotid artery in medical assessments lies in its accessibility and the strong pulse it carries, which can provide vital information about cardiovascular health.

for comparison: - the **superficial temporal artery** is found just anterior to the ear. it is generally used to assess the pulse in scenarios focusing on the temporal region. - the **facial artery** can be palpated at the lower margin of the mandible, approximately one third from the angle of the mandible towards the chin. this artery is less commonly used for routine pulse checks. - the **radial artery** is located at the wrist on the thumb side. it is another common site for pulse measurement due to its superficial location and ease of access.

thus, when a pulse is taken along the anterior aspect of the neck, just to the right or left of the midline, the carotid artery is indeed the artery being used. this method is particularly useful in emergency situations or when comprehensive assessment of the patient's central circulation is required. it is essential to palpate gently to avoid excessive pressure on the carotid sinus, which can trigger a reflex that dramatically lowers the heart rate, potentially leading to fainting or other complications.
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