Certified Imaging Informatics Professional (CIIP) Practice Exam

What is the image matrix size for a typical computed tomography (CT) image?

1. 256 X 256 X 8 bits

2. 512 X 512 X 12 bits

3. 1024 X 1024 X 10 bits

4. 2048 X 2048 X 16 bits

The correct answer is: 512 X 512 X 12 bits

The image matrix size for a typical computed tomography (CT) image is often represented as 512 x 512 x 12 bits. This matrix size reflects a standard resolution used in many CT imaging systems, which allows for sufficient detail while managing radiation dose and processing capabilities. In this context, the first two numbers in the matrix size (512 x 512) refer to the number of pixels arranged in two dimensions of the image. Having a matrix of this size provides a balance between image quality and data storage requirements. The third part, 12 bits, indicates the depth of each pixel, meaning that each pixel can represent a range of values (from 0 to 4095) to provide different levels of brightness based on the attenuation properties of the tissues imaged. This bit depth is crucial for distinguishing between different tissue types, which enhances diagnostic accuracy. Other options present differing combinations of matrix sizes and bit depths. While they may represent capabilities of various imaging systems, the 512 x 512 x 12 configuration is widely recognized as a baseline for standard CT imaging, offering an effective compromise to optimize performance in clinical practice.