Endoscopic measurement of lesion size: Improved accuracy with image processing

Vakil, Nimish B.; Smith, Warren E.; Bourgeois, Keith; Everbach, E. Carr; Knyrim, K.

doi:10.1016/s0016-5107(94)70163-6

Cited by 61 publications

(34 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The requirement for each group to develop their own software has, until now, no doubt limited the use of numerical correction algorithms. The barrel distortion correction algorithms of the "off the shelf" commercial image processing that the authors used, compare well to the custom software developed by others [20]. This suggests that such correction could be routinely used for research or possibly clinical applications.…”

Section: Discussionmentioning

confidence: 55%

See 1 more Smart Citation

A new method to perform quantitative measurement of bronchoscopic images

McFawn

Forkert²,

Fisher³

2001

European Respiratory Journal

View full text Add to dashboard Cite

A new method to perform quantitative measurement of bronchoscopic images. P.K. McFawn, L. Forkert, J.T. Fisher. #ERS Journals Ltd 2001. ABSTRACT: Bronchoscopy is a commonly used clinical tool that provides a direct image of the bronchial lumen. However, bronchoscopy has seen little use as a quantitative measurement tool, mainly because of the wide-angle lens which distorts the image. The present authors have tested the ability of numerical algorithms and commercial software to correct for this distortion.Test objects of known size were imaged with four different bronchoscopes. Commercial image analysis software was used to measure the size of features in the images before and after applying distortion correction algorithms. The technique was then applied by measuring airway narrowing in anaesthetized pigs during vagal stimulation.Without correction, object size near the edge of the field of view is underestimated by y40%. The error in measured diameter of concentric circles was dependent on the radius of the circle, increasing to 25% for circles occupying 90% of the field. Third order polynomial functions were required to correct these errors. After correction, errors were independent of object size or location in the image. Correction for lens distortion was independent of the distance between bronchoscope and object.The authors conclude that modern image processing software can correct for the distortion produced by wide-angle bronchoscope lenses.

show abstract

Section: Discussionmentioning

confidence: 55%

“…The extent of distortion depends on how close the object is located to or extends to the edge of the field [13]. Without correction, only small objects near the centre can be measured accurately [13,15,19,20].…”

mentioning

confidence: 99%

A new method to perform quantitative measurement of bronchoscopic images

McFawn

Forkert²,

Fisher³

2001

European Respiratory Journal

View full text Add to dashboard Cite

show abstract

“…A study of the open-biopsy forceps measurement technique compared the error frequency when using original vs. corrected endoscopic images (where the radial distortion was removed). The mean error of the forceps technique in vivo using the original image was 26.5% +/À 5.7% (under-estimation of size), which improved significantly to an error of 2.8% +/À 3.2% with the distortion correction (25). The RD effect is illustrated in Figure 1, where the left side shows an image of a checkerboard acquired with a standard 4 mm arthroscope.…”

Section: Introductionmentioning

confidence: 96%

“…Previous studies have addressed the issue of RD in medical endoscopy and reported that distortion correction improved depth perception, in both 2D endoscopy and the new 3D endoscopy (26), while reducing the frequency of errors in activities of diagnosis (9,12). However, to the best of our knowledge, no study has been conducted to assess the effect of RD in surgical performance, which means that this work is the first of its type.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Benefits of radial distortion correction in arthroscopic surgery: a first experimental study on a knee model

Duarte

Ferreira

Oliveira

et al. 2014

Int J Med Robotics Comput Assist Surg

View full text Add to dashboard Cite

show abstract

Endoscopy

Vakil¹,

Affi²

2002

Encyclopedia of Imaging Science and Technology

View full text Add to dashboard Cite

Endoscopy is an imaging method that is used to visualize the interior of human organs. The widest application of endoscopy is in the gastrointestinal tract. Specialized instruments have been developed to image specific gastrointestinal organs. Gastroscopes, which are passed through the mouth, are used to examine the esophagus, the stomach, and the duodenum. Enteroscopes, also through the mouth, are specially designed to examine the small intestine. Colonoscopes, passed through the anal orifice, are used to examine the lower gastrointestinal tract. There are two major classes of instruments, fiber‐optic endoscopes that consisting of a bundle of coaxial fiber‐optic bundles or electronic endoscopes that rely on a charge coupled device. The electronic endoscope consists of a charge‐coupled device that transmits an electronic signal resulting in an image that is visualized on a television monitor. Modern endoscopes, whether electronic or fiber‐optic contain three systems: ( 1 ) a mechanical system used to deflect the endoscope tip, ( 2 ) a system of air/water and biopsy/suction channels with controls. Insufflation of air is important to distend the walls of the organ being studied. Suction capabilities allow the aspiration of contents from the gastrointestinal tract for examination. In other cases, fluid in the gastrointestinal tract obscures the view and suction allows the fluid to be aspirated away. ( 3 ) The imaging system which may be fiber‐optic or electronic is used to visualize tissue. The most frequent reasons for which endoscopy is performed and the organs that are visualized are listed. Examples of endoscopic images are given.

show abstract

Endoscopic measurement of lesion size: Improved accuracy with image processing

Cited by 61 publications

References 10 publications

A new method to perform quantitative measurement of bronchoscopic images

A new method to perform quantitative measurement of bronchoscopic images

Benefits of radial distortion correction in arthroscopic surgery: a first experimental study on a knee model

Endoscopy

Contact Info

Product

Resources

About