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2015 ; 94
(26
): e1044
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Quantification of Pulmonary Inflammatory Processes Using Chest Radiography:
Tuberculosis as the Motivating Application
#MMPMID26131814
Giacomini G
; Miranda JRA
; Pavan ALM
; Duarte SB
; Ribeiro SM
; Pereira PCM
; Alves AFF
; de Oliveira M
; Pina DR
Medicine (Baltimore)
2015[Jul]; 94
(26
): e1044
PMID26131814
show ga
The purpose of this work was to develop a quantitative method for evaluating the
pulmonary inflammatory process (PIP) through the computational analysis of chest
radiography exams in posteroanterior (PA) and lateral views. The quantification
procedure was applied to patients with tuberculosis (TB) as the motivating
application.A study of high-resolution computed tomography (HRCT) examinations of
patients with TB was developed to establish a relation between the inflammatory
process and the signal difference-to-noise ratio (SDNR) measured in the PA
projection. A phantom essay was used to validate this relation, which was
implemented using an algorithm that is able to estimate the volume of the
inflammatory region based solely on SDNR values in the chest radiographs of
patients.The PIP volumes that were quantified for 30 patients with TB were used
for comparisons with direct HRCT analysis for the same patient. The Bland-Altman
statistical analyses showed no significant differences between the 2
quantification methods. The linear regression line had a correlation coefficient
of R = 0.97 and P < 0.001, showing a strong association between the volume that
was determined by our evaluation method and the results obtained by direct HRCT
scan analysis.Since the diagnosis and follow-up of patients with TB is commonly
performed using X-rays exams, the method developed herein can be considered an
adequate tool for quantifying the PIP with a lower patient radiation dose and
lower institutional cost. Although we used patients with TB for the application
of the method, this method may be used for other pulmonary diseases characterized
by a PIP.
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