Formation of a CT Image - Tomographic Acquisition

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What is the range of the floating point numbers resulting from the CT reconstruction process?

From 0.0 to 1.0 (correct)
From -300 to -90
From -1000 to 3095
From -90 to +3000

Which of the following represents the CT number for water in the patient?

-1000
30
0 (correct)
-90

For dense bone and areas with high contrast agent, what is the approximate range of CT numbers?

+30 to +3000 (correct)
-1000 to 3095
0 to 50
-300 to -90

How are CT images normalized and truncated for clinical use?

To a range between -1000 and 3095 (B) Signup and view all the answers

What does a CT(x,y) number in an image represent?

The Hounsfield unit at that point (C) Signup and view all the answers

How does the CT number in a pixel relate to the attenuation coefficient for that voxel?

They are directly proportional (B) Signup and view all the answers

Which physical property of tissue influences Compton scatter in CT images?

Density (D) Signup and view all the answers

What is the role of the linear attenuation coefficient in forming contrast in medical CT?

It plays a dominant role in forming contrast based on tissue density (A) Signup and view all the answers

What does the window width determine in CT imaging?

The contrast of the image (C) Signup and view all the answers

How are helical CT data sets interpolated to compensate for differences in source paths?

Interpolated into a series of planar image data sets (B) Signup and view all the answers

What is the purpose of Helical CT scanning producing a helical trajectory around the patient?

To reduce patient dose (B) Signup and view all the answers

In CT imaging, how does slice thickness affect the contrast produced from an object?

It produces greater contrast from background when positioned at the center of the CT slice (A) Signup and view all the answers

What is true about detector arrays used in modern CT systems?

They use solid-state scintillator detectors (D) Signup and view all the answers

What is the purpose of the convolution technique in CT image reconstruction?

To remove noise and produce sharper images (B) Signup and view all the answers

Which algorithm is known for providing fine detail in CT images but with increased noise?

Bone algorithm (B) Signup and view all the answers

What does a sharp filter do in CT image reconstruction?

Enhances spatial resolution (B) Signup and view all the answers

How are pixels and voxels related in a CT image?

The pixel width and height are equal to the voxel width and height (B) Signup and view all the answers

Which step precedes the application of the CT reconstruction algorithm in CT image formation?

Preprocessing of raw data (C) Signup and view all the answers

What is the main function of filtered back projection in CT image reconstruction?

To build up the CT image in the computer (A) Signup and view all the answers

Which technique is used to blur raw data during CT image formation?

Convolution technique (D) Signup and view all the answers