This research is concerned with Multiple Pinhole Coded Aperture (MPCA) radioisotope tomographic imaging. In the process of radioisotope tomographic imaging, RCT, Time Modulation, MPCA and other methods are used. In comparison with the other available methods, MPCA imaging is a relatively simple procedure. In contrast with the other methods, there is no need to rotate either the patient or the detector. Using the usual Gamma-camera, there is no need for any alterations; using an optical reconstruction or a mini-computer system, a tomographic image can be produced. However, using the MPCA method, reconstruction of a tomographic image is very problematic. Due to the many problems involved in reconstruction of the tomographic image using the MPCA method, at the present, only a 7-pinhole form of the MPCA is being used clinically, limited to small organs (especially the heart). This research is an experimental effort to overcome the problem of reconstruction of a tomographic image using MPCA. By using a reconstruction algorithm, it has been made possible to use the MPCA method in order to depict large organs, (not only the heart, but organs such as the brain, liver and lung. ). A corrected reconstructed image and a digital filter software were obtained.
This, is a study of the health, psycological condition, daily behaviour, and diet of the aged, in terms of their daily life and community conditions. This report deals with the problems of the aged living in urban areas, placing the emphasis on diet.
Expression of GR-MTV antigen was ob served on the mammary tissues of virgin mice in GRS /A, BALB/c, their reciprocal hybrids, GRfBALB and BALBfGR by PAP method using the antiserum against whole MuMTV virion. The expression was detected first in some of mammary parenchymal cells of GRS/A females aged 14 days, and it reached maximum on the age of 50days and could be seen throughout their lives. On the contrary, no viral antigen could be found in BALB/c mice up to the age of 500 days. In the hybrids and GRfBALB mice, which might received endogenous MTV, the females aged 30 and 50 days showed the same appearance of viral antigen expression as in GRS/A strain. In the virgins of BALBfGR carrying only milkborne GR-MTV, the first expression of viral antigen was detected in some secreting acini clustered within the antigen-negative mammary tissues at the age of 140 days. Such a late appearance of exogenous MTV antigen expression was expedited by either pituitary isograft into the mammary tissues or pregnancy.