Nodule detection in digital chest radiography: effect of nodule location.

Håkansson, MarkusGothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics (author)

Most detection studies in chest radiography treat the entire chest image as a single background or divided into the two regions parenchyma and mediastinum. However, the different parts of the lung show great variations in attenuation and structure, leading to different amounts of quantum noise and scattered radiation as well as different complexity. Detailed data on the difference in detectability in the different regions are of importance. The purpose of this study was to quantify the difference in detectability between different regions of a chest image. The chest X ray was divided into six different regions, where each region was considered to be uniform in terms of detectability. Thirty clinical chest images were collected and divided into the different regions. Simulated designer nodules with a full-width-at-fifth-maximum of 10 mm but with varying contrast were added to the images. An equal number of images lacking pathology were included and a receiver operating characteristic (ROC) study was conducted with five observers. Results show that the image contrast needed to obtain a constant value of A(z) (area under an ROC curve) differs by more than a factor of four between different regions.

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Radiologi och bildbehandling hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Radiology, Nuclear Medicine and Medical Imaging hsv//eng
Artifacts
Humans
Image Processing
Computer-Assisted
Lung
pathology
radiography
Lung Neoplasms
diagnosis
radiography
Models
Anatomic
Monte Carlo Method
Observer Variation
ROC Curve
Radiographic Image Enhancement
methods
Radiographic Image Interpretation
Computer-Assisted
methods
Radiography
methods
Radiography
Thoracic
methods
Scattering
Radiation
Software
X-Rays
MEDICINE

Båth, Magnus,1974Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics(Swepub:gu)xbatma (author)
Börjesson, SaraGothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics (author)
Kheddache, Susanne,1949Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology(Swepub:gu)xkhesu (author)
Flinck, Agneta,1953Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology(Swepub:gu)xfliag (author)
Ullman, Gustaf,1977-Linköpings universitet,Hälsouniversitetet,Medicinsk radiofysik(Swepub:liu)gusul07 (author)
Månsson, Lars Gunnar,1951Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics(Swepub:gu)xmanla (author)
Göteborgs universitetInstitutionen för särskilda specialiteter, Avdelningen för radiofysik (creator_code:org_t)

In:Radiation protection dosimetry: Oxford University Press (OUP)114:1-3, s. 92-60144-84201742-3406

By the author/editor: Håkansson, Marku ...; Båth, Magnus, 19 ...; Börjesson, Sara; Kheddache, Susan ...; Flinck, Agneta, ...; Ullman, Gustaf, ...; show more...; Månsson, Lars Gu ...; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Radiology Nuclea ...

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