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Lab 4: Edge Response, Point Spread Function and MTF

Lab 4: Edge Response, Point Spread Function and MTF

In this lab exercise, students learn a Fourier transform based technique to determine the MTF of a CT scanner. Students image a step-edge phantom and plot attenuation profiles (edge response) across a high contrast edge. Students analyze edge response profiles and perform Fourier transforms to calculate and plot the MTFs for different reconstruction resolutions. MATLAB® code is provided as one method for calculating the Fourier transforms. Students compare their results with the results obtained from Lab #3.

Lab 5: Contrast to Noise Ratio

Lab 5: Contrast to Noise Ratio

In this lab exercise, students learn the importance of contrast and noise in the context of low-dose imaging. Students decrease the contrast to noise ratio of acquired images by adding Gaussian noise. This is analogous to lowering the contrast to noise ratio by lowering the imaging dose. Students measure contrast to noise ratio in images of a phantom with cone-shaped fingers of different optical density. In these images, students assess the ability to resolve low contrast fingers as noise is increased (dose is decreased). This is an important topic in view of the “Image Gently” (www.pedrad.org) approach used in medical imaging.

Lab 6: Image Artifacts due to Faulty Detectors and Missing Projections

Lab 6: Image Artifacts due to Faulty Detectors and Missing Projections

In this lab exercise, students learn to recognize artifacts in CT images that are caused by incorrect or incomplete projection data. Students manipulate scan data to introduce bad pixels or missing projections. These input errors are similar to incorrect data sometimes found in medical CT scanners. Students observe the resulting artifacts (e.g. rings, streaks) in sinograms and reconstructed CT images.

RELATED PRODUCTS

DeskCAT™ Optical CT Scanner for Education
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DeskCAT™ Optical CT Scanner for Education

Is a state-of-the-art multi-slice optical CT scanner designed for educators requiring a safe and hands-on approach to teaching medical imaging in a classroom or laboratory setting.

Beginner Lab Exercises
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Beginner Lab Exercises

Each DeskCAT comes with 3 helpful beginner lab exercises to assist the educator in teaching the principles of Computed Tomography to a wide range of students.

Advanced  Lab Exercises
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Advanced Lab Exercises

For advanced level students, we offer 3 lab exercises to meet requirements set forth by the CAMPEP accredited programs in Medical Biophysics.

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