Radiography system.

摘要

A radiography system including a radiation source (X) and a detector array (D) spaced sufficiently from the source to accommodate the placement of a body between the source and detector array. A mechanism (L, M) is provided for scanning the detector array relative to the body while aligned with the radiation source. Power means actuates the source to direct radiation through the body towards the detector array during scanning. The detector array comprises a number of detector elements responsive to incident radiation to produce electrical signals indicative of the radiation. Circuitry (TD1, C, T) coupled to the detector array responds to the detector signals to generate an image representing internal structure of the body, as represented by the radiation emergent from the body. The detector array (D) comprises a plurality of individual detector elements arranged in a pattern of staggered columns, the array being scanned in a direction perpendicular to the columns. This geometry improves the resolving capability of the detector array in a direction parallel to the columns. Resolution in the direction perpendicular to the columns is improved by employment of time delay and integrate circuitry (TDI) which samples detector element outputs at successive increments of detector motion less than the width of a single detector element in the scanning direction.