Calculate the pixel size given these variables: Matrix size = 512 x 512 and Field-of-View = 12 cm.

To calculate the pixel size, you need to divide the field-of-view (FOV) by the matrix size. The matrix size defines the number of pixels in each dimension, while the FOV indicates the physical area being imaged.

Given that the matrix size is 512 x 512, this means there are 512 pixels along each dimension (both width and height). The FOV is given as 12 cm. To determine the size of each pixel, you can use the following formula:

Pixel Size = FOV / Matrix Size

For our case:

• FOV = 12 cm

• Matrix Size = 512 pixels

Now calculating the pixel size:

Pixel Size = 12 cm / 512 pixels = 0.0234375 cm

When rounded to three decimal places, this is approximately 0.023 cm.

This calculation illustrates why the first choice is correct. It effectively shows how the size of each individual pixel can be derived from the overall dimensions of the imaging area divided by the resolution (number of pixels).