open access

https://hdl.handle.net/2115/52921

Non-Collimatorによるシンチグラムの画像復元について

英語

1995-12

北海道大学医療技術短期大学部

北海道大学医療技術短期大学部紀要

8

151-156

「久保直樹，花田博之著：Non-Collimatorによるシンチグラムの画像復元について, 北海道大学医療技術短期大学部紀要，8, p.151-156(1995)」の英訳版

We have conducted an experiment on restoring scintigram images obtained without the use of collimators. Uncollimated images of liver slice phantoms filled with 99mTc were taken at a phantom-camera distance of 0 cm. The sensitivity under these conditions was about one thousand times higher than that using a low-energy high-resolution collimator. Uncollimated images were restored using unsharp masking in combination with spatial filtering. The unsharp masking process involved subtracting two images taken at phantom-camera distances of 0 and 2.3 cm to produce a difference image. The mean squared errors found were 0.56 for the uncollimated images, 0.54 for the images processed with the spatial filter only, and 0.53 for the images produced using unsharp masking followed by spatial filtering. Thus, the images processed using both unsharp masking and the spatial filter bore the closest resemblance to the actual images. Also, since this method was capable of revealing the shape of the phantom, it may already be usable for imaging large lesions, such as in lung perfusion scintigraphy.

学術雑誌論文

Accepted Manuscript

0915-2083

AN10054499