Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1974-09-27
1976-03-30
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
G01T 120
Patent
active
039476847
ABSTRACT:
In the isocount scintiscanning, the detector probe is scanned over the object plane such that it is stopped at each observation point during the time T necessary for the input pulses to reach a preset value N. The count rate R = N/T is then calculated electronically and the two-dimensional array of said count rate R.sub.i,j, output of said isocount scanner, is read in the memory of the display system, which is the subject to the present patent. These data are read out from said memory in synchronism with the television horizontal sweep signal; each value of count rate R.sub.i,j is compared to a reference slice level a.sub.k and if R.sub.i,j .gtoreq.a.sub.k, black is assigned to the corresponding picture element on the screen; if R.sub.i,j <a.sub.k, white is assigned to the corresponding element on the screen. If said slice level a.sub.k is changed sequentially with convenient velocity, there is observed on the screen a kind of silhouette corresponding to those areas with count rate higher than the slice level a.sub.k, and said silhouette moves by changing its form. The human sensors are very keen to variations and this process makes the detection of details of the picture very easy. Moreover, a two-dimensional interpolation is employed in order to display the picture with 3 mm .times. 3 mm elements, for example, from data taken 6 mm apart. By this expedient, it is possible to compose a scintigram in a shorter scanning time, without deterioration of picture quality.
REFERENCES:
patent: 3683184 (1972-08-01), Brunnett et al.
patent: 3860822 (1975-01-01), Owens, Jr.
Ikebe Jun
Nawa Oscar Akio
Beall, Jr. Thomas E.
Hitachi Medical Corporation
Willis Davis L.
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