An Automatic Lung Field Segmentation Algorithm Based on Improved Snake Model in X-ray Chest Radiograph

The delineation of bone structures is a crucial step in Chest X-ray image analysis. In the case of lung field segmentation, the main approach after the localization of bone structures is either their individual analysis or their suppression. We prove that a very fast and approximate identification of bone points that are most probably located inside the lung area can help in the segmentation of the lung fields, without the need for bone structure suppression. We introduce a deformation-tolerant region growing procedure. In a two-step approach, a sparse representation of the rib cage is guided to several support points on the lung border. We studied and dealt with the presence of other bone structures that interfere with the lung field. Our method demonstrated very robust behavior even with highly deformed lung appearances, and it achieved state-of-the-art performance in segmentations for the vast majority of evaluated CXR images. Our region growing approach based on the automatically detected rib cage points achieved an average Dice similarity score of 0.92 on the Montgomery County Chest X-ray dataset. We are confident that bone seed points can robustly mark a high-quality lung area while remaining unaffected by different lung shapes and abnormal structures.

Download Full-text

Hubungan antara Luas Lesi pada Foto Toraks Penderita TB Paru Dewasa yang Memiliki Riwayat Diabetes Melitus dengan Indeks Massa Tubuh di Rumah Sakit Hasan Sadikin Bandung

Jurnal Radiologi Indonesia ◽

10.33748/jradidn.v1i3.18 ◽

2016 ◽

Vol 1 (3) ◽

pp. 138-144

Author(s):

Ina Edwina ◽

Rista D Soetikno ◽

Irma H Hikmat

Keyword(s):

Chest Radiograph ◽

Chi Square ◽

Pulmonary Tb ◽

X Ray ◽

Consecutive Sampling ◽

Close Relationship ◽

Chi Square Test ◽

Chest X Ray ◽

The Relationship ◽

Diabetes Melitus

Background: Tuberculosis (TB) and diabetes mellitus (DM) prevalence rates are increasing rapidly, especially in developing countries like Indonesia. There is a relationship between TB and DM that are very prominent, which is the prevalence of pulmonary TB with DM increased by 20 times compared with pulmonary TB without diabetes. Chest X-ray picture of TB patients with DM is atypical lesion. However, there are contradictories of pulmonary TB lesion on chest radiograph of DM patients. Nutritional status has a close relationship with the morbidity of DM, as well as TB.Objectives: The purpose of this study was to determine the relationship between the lesions of TB on the chest radiograph of patients who su?er from DM with their Body Mass Index (BMI) in Hasan Sadikin Hospital Bandung.Material and Methods: The study was conducted in Department of Radiology RSHS Bandung between October 2014 - February 2015. We did a consecutive sampling of chest radiograph and IMT of DM patients with clinical diagnosis of TB, then the data was analysed by Chi Square test to determine the relationship between degree of lesions on chest radiograph of pulmonary TB on patients who have DM with their BMI.Results: The results showed that adult patients with active pulmonary TB with DM mostly in the range of age 51-70 years old, equal to 62.22%, with the highest gender in men, equal to 60%. Chest radiograph of TB in patients with DM are mostly seen in people who are obese, which is 40% and the vast majority of lesions are minimal lesions that is equal to 40%.Conclusions: There is a signifcant association between pulmonary TB lesion degree with BMI, with p = 0.03

Download Full-text

Portable Ventilation/Perfusion Scanning is Useful for Evaluating Clinically Significant Pulmonary Embolism in the ICU Despite Abnormal Chest Radiography

Journal of Intensive Care Medicine ◽

10.1177/0885066618807859 ◽

2018 ◽

Vol 35 (10) ◽

pp. 1032-1038 ◽

Cited By ~ 1

Author(s):

Aaron S. Weinberg ◽

William Chang ◽

Grace Ih ◽

Alan Waxman ◽

Victor F. Tapson

Keyword(s):

Pulmonary Embolism ◽

Chest Radiograph ◽

High Probability ◽

Hemodynamic Instability ◽

X Rays ◽

X Ray ◽

Abnormal Chest ◽

Chest X Ray ◽

Low Probability ◽

Clinically Significant

Objective: Computed tomography angiography is limited in the intensive care unit (ICU) due to renal insufficiency, hemodynamic instability, and difficulty transporting unstable patients. A portable ventilation/perfusion (V/Q) scan can be used. However, it is commonly believed that an abnormal chest radiograph can result in a nondiagnostic scan. In this retrospective study, we demonstrate that portable V/Q scans can be helpful in ruling in or out clinically significant pulmonary embolism (PE) despite an abnormal chest x-ray in the ICU. Design: Two physicians conducted chart reviews and original V/Q reports. A staff radiologist, with 40 years of experience, rated chest x-ray abnormalities using predetermined criteria. Setting: The study was conducted in the ICU. Patients: The first 100 consecutive patients with suspected PE who underwent a portable V/Q scan. Interventions: Those with a portable V/Q scan. Results: A normal baseline chest radiograph was found in only 6% of patients. Fifty-three percent had moderate, 24% had severe, and 10% had very-severe radiographic abnormalities. Despite the abnormal x-rays, 88% of the V/Q scans were low probability for a PE despite an average abnormal radiograph rating of moderate. A high-probability V/Q for PE was diagnosed in 3% of the population despite chest x-ray ratings of moderate to severe. Six patients had their empiric anticoagulation discontinued after obtaining the results of the V/Q scan, and no anticoagulation was started for PE after a low-probability V/Q scan. Conclusion: Despite the large percentage of moderate-to-severe x-ray abnormalities, PE can still be diagnosed (high-probability scan) in the ICU with a portable V/Q scan. Although low-probability scans do not rule out acute PE, it appeared less likely that any patient with a low-probability V/Q scan had severe hypoxemia or hemodynamic instability due to a significant PE, which was useful to clinicians and allowed them to either stop or not start anticoagulation.

Download Full-text

A new threshold segmentation algorithm for segmenting micro-focus X-ray BGA solder joint image

Proceedings of the 4th International Conference on Information Technology and Management Innovation ◽

10.2991/icitmi-15.2015.197 ◽

2015 ◽

Author(s):

Hui Wang ◽

Dan Liu

Keyword(s):

Solder Joint ◽

Segmentation Algorithm ◽

Threshold Segmentation ◽

X Ray

Download Full-text

A comparison of the chest radiograph and computerised tomography in assessing lung changes in acute spinal injuries—an assessment of their prevalence and the accuracy of the chest X-ray compared with CT in their assessment

Spinal Cord ◽

10.1038/sc.1995.27 ◽

1995 ◽

Vol 33 (3) ◽

pp. 121-125 ◽

Cited By ~ 1

Author(s):

G Bain ◽

R Bodley ◽

A Jamous ◽

S Williams ◽

J Silver

Keyword(s):

Chest Radiograph ◽

Spinal Injuries ◽

Computerised Tomography ◽

X Ray ◽

Chest X Ray

Download Full-text

Prevalence of pneumonia in children under 12 years of age who undergo abdominal radiography in the emergency department

CJEM ◽

10.1017/s1481803500015293 ◽

2007 ◽

Vol 9 (05) ◽

pp. 347-351 ◽

Cited By ~ 6

Author(s):

Valérie Homier ◽

Colette Bellavance ◽

Marianne Xhignesse

Keyword(s):

Emergency Department ◽

Abdominal Pain ◽

Chest Radiograph ◽

Chest Radiography ◽

Acute Abdominal Pain ◽

Tertiary Care ◽

Abdominal Radiograph ◽

Upper Respiratory Tract ◽

Abdominal Radiography ◽

X Ray

ABSTRACT Objective: Pneumonia is a well-known cause of acute abdominal pain in children. However, the utility of chest radiography in this setting is controversial. We sought to determine the prevalence of pneumonia in children under 12 years of age who had abdominal pain and underwent abdominal radiography when visiting an emergency department (ED). We also aimed to describe the signs and symptoms of children diagnosed with pneumonia in this context. Methods: We conducted a retrospective analysis of electronic data from ED visits to a tertiary care centre by children 12 years of age and under who were seen between June 1, 2001, and June 30, 2003, and who underwent both an abdominal and a chest radiograph during the same visit, or an abdominal x-ray at a first visit as well as a chest x-ray in the 10 days following the initial visit. Results: Of 1584 visits studied, 30 cases of pneumonia were identified, for a prevalence of 1.89% (95% confidence interval 1.22%–1.56%). If chest radiography had been limited to children who presented with fever, cough and symptoms of an upper respiratory tract infection (URTI), the diagnosis of pneumonia would have been missed in only 2/1584 visits (0.13%). Conclusion: Children aged 12 years and under presenting to the ED with acute abdominal pain and in whom an abdominal radiograph is requested need only undergo a chest radiograph in the presence of cough, fever or other symptoms of a URTI.

Download Full-text