The cost of arrays are often (more or less) proportional to the number of elements. Often there are also technical difficulties in fitting a high number of elements and cables on the surface of a transducer. It is therefore favorable to reduce the number of elements without loss if imaging quality. One aim in the thesis is to show that flat 2D-arrays (used in cardiac imaging) that have been sparsed diagonally respond favorably to curving. A similar analysis is also applied to sonars.