An apparatus for indicating the location of a radiation sensor in a radiographic imaging system, comprising: a two-dimensional radiation sensing apparatus that provides one or more radiation measurement regions, wherein each radiation measurement region has a spatial position relative to a patient to be imaged and provides a signal that indicates the level of radiation received over the region, the two-dimensional radiation sensing apparatus comprising a two-dimensional array of radiant energy sensing pixels arranged in a matrix of rows and columns for obtaining a radiographic image and for exposure measurement, each of the radiant energy sensing pixels consisting of at least one photosensor element and at least one switching element; a first subset of the two-dimensional array of radiant energy sensing pixels assigned as exposure control sensing elements to provide an indication of the level of radiation received using a combined signal from multiple exposure control sensing elements that is compared against a threshold for terminating exposure, wherein the exposure control sensing elements are arranged in the one or more radiation measurement regions and are configured to be addressed at predetermined intervals during an exposure; a second subset of the two-dimensional array of radiant energy sensing pixels using the stored image signal from each individual pixel to form a visible image, wherein each individual pixel is configured to be addressed only once per exposure immediately following exposure, and wherein the two-dimensional array of radiant energy sensing pixels including the first subset of pixels and the second subset of pixels are read out to obtain the radiographic image; a position-sensing apparatus that is energizable to relate the spatial position of the one or more radiation sensing regions to the patient; and an image forming apparatus that is actuable to display the spatial position of each of the one or more radiation measurement regions relative to the patient, the image forming apparatus being a display monitor configured to display an outline of the one or more radiation measurement regions overlaid over an outline image of the patient. a two-dimensional radiation sensing apparatus that provides one or more radiation measurement regions, wherein each radiation measurement region has a spatial position relative to a patient to be imaged and provides a signal that indicates the level of radiation received over the region, the two-dimensional radiation sensing apparatus comprising a two-dimensional array of radiant energy sensing pixels arranged in a matrix of rows and columns for obtaining a radiographic image and for exposure measurement, each of the radiant energy sensing pixels consisting of at least one photosensor element and at least one switching element; a first subset of the two-dimensional array of radiant energy sensing pixels assigned as exposure control sensing elements to provide an indication of the level of radiation received using a combined signal from multiple exposure control sensing elements that is compared against a threshold for terminating exposure, wherein the exposure control sensing elements are arranged in the one or more radiation measurement regions and are configured to be addressed at predetermined intervals during an exposure; a second subset of the two-dimensional array of radiant energy sensing pixels using the stored image signal from each individual pixel to form a visible image, wherein each individual pixel is configured to be addressed only once per exposure immediately following exposure, and wherein the two-dimensional array of radiant energy sensing pixels including the first subset of pixels and the second subset of pixels are read out to obtain the radiographic image; a position-sensing apparatus that is energizable to relate the spatial position of the one or more radiation sensing regions to the patient; and an image forming apparatus that is actuable to display the spatial position of each of the one or more radiation measurement regions relative to the patient, the image forming apparatus being a display monitor configured to display an outline of the one or more radiation measurement regions overlaid over an outline image of the patient.