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CT Imaging Technology Basics

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Questions and Answers

What is the primary purpose of the rotating radiation source in a CT scan?

To reconstruct cross-sectional slices of the patient's anatomy

To detect the X-ray attenuation at different angles around the patient

To transmit a highly collimated beam of X-rays through the patient (correct)

To create a single radiographic image of the patient

What is the primary difference between a radiograph and a CT scan in terms of the X-ray attenuation data collected?

Radiographs do not measure X-ray attenuation, while CT scans use thousands of measurements of X-ray attenuation to reconstruct cross-sectional slices.

Radiographs measure X-ray attenuation between the source and a single point on the detector, while CT scans measure attenuation between the source and thousands of points on the detector. (correct)

Radiographs measure a single value of X-ray attenuation, while CT scans measure an average attenuation value for each voxel in the image.

Radiographs measure X-ray attenuation at a single angle, while CT scans measure attenuation at thousands of angles.

What is the purpose of the computer in a CT machine?

To measure the X-ray attenuation at different angles

To rotate the X-ray source and detector around the patient

To reconstruct the cross-sectional slices of anatomy from the thousands of X-ray attenuation measurements (correct)

To control the movement of the patient table

What is the purpose of converting the average X-ray attenuation values for each voxel to CT numbers or Hounsfield Units (HU)?

To standardize the attenuation values and allow for quantitative analysis Signup and view all the answers

What is the primary advantage of CT imaging over radiographs in terms of the information provided?

CT scans can create cross-sectional slices of the patient's anatomy, while radiographs only provide a single projection image. Signup and view all the answers

What is the purpose of the donut-shaped tube or gantry that houses the X-ray source and detector in a CT machine?

To allow for the rotation of the X-ray source and detector around the patient Signup and view all the answers

What is the Hounsfield Unit (HU) value for air in CT imaging?

-100 HU Signup and view all the answers

Why is it important to adjust the window width and level in CT imaging?

To improve contrast between different tissues based on their HU values Signup and view all the answers

What does a narrow window setting in CT imaging primarily help maximize?

Contrast resolution between tissues with similar density Signup and view all the answers

Why is it necessary to use a wide window setting in CT imaging for some regions?

To display regions with wide density ranges and high inherent contrast Signup and view all the answers

Which tissue type would benefit most from a narrow window setting in CT imaging?

Soft tissue structures Signup and view all the answers

Compared to radiography, what advantage does CT imaging offer in terms of contrast within the orbit?

Better contrast between bone, muscles, and fat Signup and view all the answers