RTBC Image Evaluation and Quality Control (122) Practice Exam 2025 - Free Image Evaluation Practice Questions and Quality Control Study Guide

Question: 1 / 400

Which of the following tissues and materials corresponds to the highest signal intensity at the image receptor?

Bone

Soft tissue

Water

Bowel gas

The highest signal intensity at the image receptor is primarily associated with structures that have lower attenuation of X-ray or other forms of radiation, allowing more of the signal to reach the receptor. Bowel gas, which primarily consists of air, has minimal density and thus allows a significant amount of X-rays to pass through without being absorbed. This results in a higher signal intensity on the image receptor.

In contrast, bone has a high atomic number and density, leading to significant attenuation and absorption of the X-ray beam, which results in a lower signal intensity. Soft tissue presents a moderate level of attenuation, allowing some signal to pass through but not as much as bowel gas. Water, while having low attenuation compared to bone or soft tissue, still does not compare to the minimal attenuation offered by gas. Thus, bowel gas demonstrates the highest signal intensity due to its low density and greater allowance for signal penetration.

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