J Korean Radiol Soc.  1984 Mar;20(1):200-210. 10.3348/jkrs.1984.20.1.200.

Clinical application of blurred undersubtraction technique

• Shim HJ
• Kim KS
• Lee KS
• Park SS

• KMID: 2463086
• DOI: http://doi.org/10.3348/jkrs.1984.20.1.200

Abstract

Many trials on varius photographic and chemical treatment have been perforemd to get better quality ofradiographs. Among them, subtraction technique is a useful method for remove the image of bone and soft tissuestructures superimposed on blood vessel outlines. But in some angiographic examination, subtraction technique maybe unhelpful due to respiration or movement of patient during injection of contrast agent. Thus, detail subtrationimage is not produced was well as visibility of small vascualr lesion is diminished. To overcome theselimitations, so called blurred undersubtraction (BUS) technique was stired in agniogram and other radiologicexaminations. The results were as follows; i) On angiogram, 1. Visibility of small blood vessels are imporved byuniform backgroun density, especially in high density area. 2. Outline of bone and blood vessels are emphasized byedge enhancement effect. 3. Comparing to conventional subtration technique, BUS technique is easy to perform andneeds no more equipments. 4. Comparing to conventional subtraction technique, no artifact is produced on BUStechnique. ii) Good quality images were obtained on radiographs of double contrast U.G.I., enema colon study andothers. iii) Good quality images were obtained on paper print.

MeSH Terms

Artifacts
Blood Vessels
Colon
Enema
Humans
Methods
Respiration
Subtraction Technique