The Factors Influencing Quantitative Measurement of CT Lung Densitometry

VernacularTitle:定量CT肺密度测定的影响因素
Author: Fang LIU ; Ping HAN ; Gansheng FENG
Publication Type:Journal Article
From: Acta Medicinae Universitatis Scientiae et Technologiae Huazhong 2001;30(1):80-82
CountryChina
Language:Chinese
Abstract: In order to study the factors influencing quantitative measurement of CT lung densitometry, 54 healthy adults underwent lung spiral scans at 50 % vital capacity (VC). Among the 54 cases, 40 received HRCT scan at carina and 5 cm away from carina (± 5 cm) at 10 % VC and 90 % VC, 23 lung HRCT at those three sections at 50 % VC. Using automatic evaluation software-Pulmo, mean lung density (ME) and pixel index (PI) at each section were evaluated. It was found that the depth of respiration affected ME and PI markedly. The ME changed 125.91 Hu between 10 % VC to 90 % VC. The ME and PI were also influenced by collimation, age and sex. It was concluded that it was very important to control the depth of respiratory. The normal CT attenuation values for the lung should be established.