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Mitsutoshi Akiyama

Publications and source records attributed to Mitsutoshi Akiyama.

2 recordsLinked to original sources

[Construction of a bed management system using widely available software: departmental information integration including the department of radiological technology].

In recent years, the distribution of medical information through Internet technology has been increasingly promoted as a result of the December 2001 initiative of the Ministry of Health, Labor and Welfare known as "the grand design for the application of welfare and medical care information technology in the field of health." In June 1999, we developed a bed management system that uses a local area network (LAN). The ultimate goals of this systems configuration were the development of an order-entry system, an electronic health-record system, and improved information sharing. The system, which was created by employing widely used software, rationalized daily work by integrating patient information, hospitalization information, radiological examination reservation information, physiological examination reservation information, and rehabilitation reservation information. The radiological examination reservation information system that our radiology department uses is one of these systems. Electronic preservation of the reservation list is carried out in the radiology department, and information on examinations is input. The resulting full-scale order-entry system was introduced in July 2002, and it has improved the sharing of information among staff members.

Bed Occupancy↗

[Basic examination of in-plane spatial resolution in multi-slice CT].

In computed tomography(single-slice spiral CT, conventional CT), in-plane(x-y plane) spatial resolution is consistently identified as depending on the detector density of the in-plane(x-y plane). However, we considered that the in-plane(x-y plane) spatial resolution of multi-slice CT (MSCT) was influenced by an error in the detector's sensitivity to the Z-axis and by the frequency of use of direct row data and complementary row data when the image of spiral pitches(SP) was reconstructed. Our goal in this experiment was to analyze the relationship of the in-plane(x-y plane)spatial resolution of an asymmetric-type detector in MSCT to SP, tube current, and rotation time. By employing a tungsten wire phantom of 0.2 mm in diameter, we examined modulation transfer functions(MTF) by point-spread functions(PSF) of CT-images. Next, using the mean-square-root bandwidth theory, we analyzed the MTF of wire phantoms. The analysis of in-plane(x-y plane) spatial resolution revealed that various tube currents had no effect on the value of the mean-square-root bandwidth. However, rotation time and high spiral pitch did have an effect on mean-square-root bandwidth. Considering the results mentioned above, spiral pitch(z-axis reconstruction algorithm) had a slight effect on in-plane(x-y plane) spatial resolution of asymmetric-type detectors in MSCT. Accordingly, we proposed a new general view of VDDz(view/mm) in MSCT that considered view data density on the Z-axis according to spiral pitch(mm/rotation), rotation time(view/rotation), and slice collimation.

Tomography, Spiral Computed↗