Computed Tomography Imaging Principles

Practice flashcards for the Computer Tomography Imaging Principles lecture, focusing on key concepts, definitions, and procedures.

What is Multi-Slice Helical Computed Tomography also known as?

Volumetric Scanning.

What are the three basic ingredients that define a Helical Scan Process?

1. Continually rotating x-ray tube, 2. Constant X-ray output, 3. Uninterrupted Table Movement.

What advantage does Multi-Slice Helical Computed Tomography offer regarding contrast medium administration?

Optimization of iodinated contrast medium administration.

What is the purpose of the Interpolation Algorithm in CT imaging?

It's a special computer program that performs data interpolation to estimate values between known data points.

Define Pitch in the context of Helical Computed Tomography.

The relationship between patient couch movement and x-ray beam width.

Why is increasing pitch above 1:1 advantageous?

It increases the volume of tissue that can be imaged at a given time.

What does the term 'Artifact' refer to in CT imaging?

Any discrepancy between the CT numbers represented in the image and the expected CT number.

What is the purpose of Filtered Back Projection?

It uses Fourier theory to reduce statistical noise and improve image quality.

How does Iterative Reconstruction improve CT imaging?

It enhances contrast resolution and reduces patient radiation dose by utilizing a more computer-intensive algorithm.

What is the significance of the Hounsfield Unit in CT imaging?

It provides numerical representation of the density of each pixel.

What occurs during the Minimum Intensity Projection (MinIP) process?

It allows for detection of low-density structures by projecting the voxel with the lowest attenuation value.

What effect does motion have on Image Quality in CT?

It creates blurring, which degrades spatial resolution.

What type of artifact is caused by the polychromatic nature of x-ray beams?

Beam Hardening.

What is a common solution for Motion Artifacts during a CT scan?

Reducing scan time and improving patient communication.

What does a CT scan aim to visualize in cranial applications?

CVA, intracranial hemorrhage, facial and skull fractures, and tumors.

What is the importance of effective communication in patient care for CT Technologists/Radiographers?

It leads to less time spent talking per patient and improves the overall patient experience.

What barrier might affect patient communication?

Cultural Differences.