Which of the following are common artifacts in CT scanning?

Artifacts are commonly encountered in clinical computed tomography (CT), and may obscure or simulate pathology. There are many different types of CT artifacts, including noise, beam hardening, scatter, pseudoenhancement, motion, cone beam, helical, ring, and metal artifacts.

What is the most common artifact noted when imaging the brain in CT imaging?

The most common artifact used in the CT departments was motion artifact in brain CT (73%), and the best method to reduce motion artifact was patient preparation (87%).

What is quantum mottle artifact?

Quantum mottle or photon starvation refers to the dose-related image noise related to insufficient X-ray photons reaching the detector (Barrett and Keat 2004 ). The artifact appears as granular streaks, often in high-attenuation structures, such as those in the shoulder region (Fig. 2.5).

What are artifacts in imaging?

In medical imaging, artifacts are misrepresentations of tissue structures produced by imaging techniques such as ultrasound, X-ray, CT scan, and magnetic resonance imaging (MRI).

What is beam hardening artifact in CT scan?

Beam Hardening. The most commonly encountered artifact in CT scanning is beam hardening, which causes the edges of an object to appear brighter than the center, even if the material is the same throughout (Fig. 5a).

What causes cone beam artifacts in CT?

Cone beam effect artifacts are seen in multidetector row CT (cone beam CT) acquisitions 1. Modern CT scanners use more detector arrays to increase the number of sections acquired per rotation. This causes the x-ray beams to become cone-shaped as opposed to fan-shaped 2.

What are brain artifacts?

It is a feature appearing in an image that is not present in the original object. Many different artifacts can occur during MRI, some affecting the diagnostic quality, while others may be confused with pathology. Artifacts can be classified as patient-related, signal processing-dependent and hardware (machine)-related.

What is artifact in imaging?

An image artifact is any feature which appears in an image which is not present in the original imaged object. An image artifact is sometime the result of improper operation of the imager, and other times a consequence of natural processes or properties of the human body.

What is cone beam artifact?

What is Underdistention of the colon?

Underdistention. — Underdistention of the colon leads to collapsed colonic segments. A colonic lesion located in a collapsed segment is not visible at either 2D or 3D imaging and will be missed.

What are CT artifacts?

Artifacts can seriously degrade the quality of computed tomographic (CT) images, sometimes to the point of making them diagnostically unusable. To optimize image quality, it is necessary to understand why artifacts occur and how they can be prevented or suppressed. CT artifacts originate from a range of sources.

Do artifacts degrade the quality of CT images?

This person is not on ResearchGate, or hasn’t claimed this research yet. Artifacts can seriously degrade the quality of computed tomographic (CT) images, sometimes to the point of making them diagnostically unusable.

How can I avoid CT artifacts?

Design features incorporated into modern CT scanners minimize some types of artifacts, and some can be partially corrected by the scanner software. However, in many instances, careful patient positioning and optimum selection of scanning parameters are the most important factors in avoiding CT artifacts.

When do artifacts occur in axial CT images?

The artifacts occur when higher pitches. resultant axial images should appear circular. tion algorithm (Fig 21). For some projection Figure 21. Consecutive axial CT images from a heli-