What term describes the layout of pixel data in a digital ultrasound image as rows and columns?

• A. Matrix
• B. Memory map
• C. Pixel matrix
• D. Raster scan

Answer: (A)

Matrix describes the grid of pixels laid out in rows and columns in a digital ultrasound image. It refers to the two-dimensional array that defines where each pixel sits and the image’s dimensions (width by height). This grid is what determines spatial sampling and resolution; a larger matrix can capture finer detail. Other terms describe different ideas: a memory map is about how data are stored in a computer’s memory, and raster scan refers to the order or method of scanning/displaying lines rather than the fixed grid layout. While “pixel matrix” could be understood, the standard term for this row-and-column layout is simply matrix.