COMPUTERIZED tomographic (CT) scanning1 has rapidly achieved wide acceptance, as evidenced by recent reports of the clinical usefulness of the technique.2-13 Intracerebral hemorrhage has commanded particular attention because CT scanning permits clear localization and unequivocal characterization of the hemorrhage. A general description of the ACTA (automatic computerized transverse axial) scanner and early clinical results have been presented elsewhere8,9,11; our experience with intracerebral hemorrhage will be emphasized here.
Methods and Materials
The instrument's data output is only summarized, as more detailed descriptions are published separately.9,11 The images of the scanned tissue slices are simultaneously displayed on both a color and black-and-white television monitor. The scans are composed of a matrix of squares (160 × 160), each of which corresponds to a tissue block 1.5×1.5×7.5 mm (7.5 mm is the thickness of the cross-sectional anatomic slice). A range of ACTA numbers on a scale from 0 to 2,048
Axelbaum SP, Schellinger D, Luessenhop AJ, Di Chiro G, Harbert JC, Twigg HL. Intracerebral Hematoma: Diagnosis With Automatic Computerized Transverse Axial (ACTA) Scanning. JAMA. 1976;235(6):641–643. doi:10.1001/jama.1976.03260320047029
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