[Consideration of algorithms to presume the lesion location by using X-ray images of the stomach--geometric analysis of four direction radiography for the U region].
The author considered algorithms to presume the lesion location from a series of X-ray images obtained by four direction radiography without blind area for the U region of the stomach. The objects of analysis were six cases that protruding lesions were noticed in the U region. Firstly, from the length of short axis and measure of the lateral width of U region projected on the film, we presumed the length of longitudinal axis and angle between short axis and the film. Secondly, we calculated the rate of length to stomach walls from right side and left side of every image to the lateral width at the height passing through the center of the lesion. Using the lesion location calculated from these values, we presumed that the values that almost agreed between two images to be the lesion location. As the result of analysis, there were some cases that the lesion location could be presumed certainly or un-certainly, on the other hand, there were some cases that the lesion location could not be presumed. Since the form of the U region can be distorted by a change of position, or the angle between longitudinal axis and sagittal plane was changed, the error might have been made in calculation, and so it was considered that the lesion location could not be presumed.
Department of Radiology, Izumizaki Minami Touhoku Clinic, Fukushima Prefecture.
Shuichi
S
Henmi
D000465:Algorithms; D006801:Humans; D011859:Radiography; D013270:Stomach / Q000000981:diagnostic imaging*; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*