Summing of Adjacent Data Elements

It is common practice to sum adjacent data elements in order to simplify reconstruction or to reduce the size of the dataset. This is usually performed axially, but may also be performed radially (a process known as "mashing"). Summation of data elements axially cannot be performed uniformly across the entire field of view and image planes at the ends of the field of view have substantially reduced sensitivity compared to those in the centre. This effect is fairly simple to account for, since the degree of summing is always known. However, it can complicate the process of correcting for other effects if the summing is performed prior to normalisation [10,11].

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