The parameter name shall be “rows”.
The value shall be expressed as an integer, representing the image height to be returned. It is OPTIONAL. It shall not be present if contentType is application/dicom.
If both “rows” and “columns” are specified, then each shall be interpreted as a maximum, and a size will be chosen for the image within these constraints, maintaining the correct aspect ratio. If the number of rows is absent and the number of columns is present, the number of rows shall be chosen in order to maintain the correct aspect ratio. If both are absent, the image (or selected region) is sent in its original size (or the size of the presentation state applied on the image), resulting as one pixel of screen image for each value in the image data matrix.
The value shall be encoded as an integer string (IS), as specified in PS 3.5.