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Electromagnetic Navigation Transthoracic Nodule Localization for Minimally Invasive Thoracic Surgery
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Imaging modalities for localization of an iStent(®).

Parul Ichhpujani1, L Jay Katz, Rick Gille

  • 1William and Anna Goldberg Glaucoma Service, Wills Eye Institute, Philadelphia, PA, USA.

Ophthalmic Surgery, Lasers & Imaging : the Official Journal of the International Society for Imaging in the Eye
|October 20, 2010
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This summary is machine-generated.

Ultrasound biomicroscopy (UBM) effectively located misplaced iStents in a human eye model. Anterior segment optical coherence tomography (AS-OCT) had limited success, while B-scan ultrasonography failed to detect the stents.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Surgery

Background:

  • The iStent is a trabecular bypass device used in glaucoma surgery.
  • Accurate placement confirmation is crucial, especially when direct visualization is challenging.
  • Existing imaging modalities require evaluation for iStent localization.

Purpose of the Study:

  • To compare Ultrasound Biomicroscopy (UBM), Anterior Segment Optical Coherence Tomography (AS-OCT), and B-scan ultrasonography.
  • To determine the optimal imaging technique for identifying iStent placement post-implantation, particularly when gonioscopy is not feasible.

Main Methods:

  • An in vitro study using a human cadaver eye.
  • Two iStents were intentionally misplaced.
  • UBM, AS-OCT, and B-scan ultrasonography were performed to visualize and locate the stents.

Main Results:

  • UBM successfully localized both misplaced iStents.
  • AS-OCT visualized the stent in the anterior chamber but failed to detect the one in the sulcus.
  • B-scan ultrasonography could not detect either misplaced iStent.

Conclusions:

  • UBM is a valuable tool for identifying iStent location in both anterior and posterior chambers.
  • AS-OCT is limited to detecting iStents within the anterior chamber.
  • B-scan ultrasonography is not suitable for detecting misplaced iStents.