Evaluation of intraocular foreign bodies by spiral computed tomography and multiplanar reconstruction

Lakits, Adalbert; Steiner, Erich; Scholda, Christoph; Kontrus, Manfred

doi:10.1016/s0161-6420(98)93289-4

Cited by 33 publications

(19 citation statements)

References 17 publications

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“…For intraocular foreign bodies, helical CT was found to be equal to conventional CT with regard to diagnostic accuracy ( Chacko et al 1997;Lakits et al 1998aLakits et al , 1998b.…”

mentioning

confidence: 99%

Helical and conventional CT in the imaging of metallic foreign bodies in the orbit

Lakits¹,

Prokesch

Scholda³

et al. 2000

Acta Ophthalmologica Scandinavica

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ABSTRACT.Purpose: To compare helical CT to conventional CT imaging in the assessment of orbital metallic foreign bodies with regard to image quality, scanning time, and radiation exposure. Methods: Twenty-four standardized metallic foreign bodies, placed into the orbit (anterior, epibulbar, posterior) of cadaver heads were studied. Helical CT scanning in the axial plane with multiplanar reconstruction of coronal and sagittal images was performed as well as conventional CT imaging with direct scanning in the axial and the coronal planes (Tomoscan SR 7000, Philips, The Netherlands). Two masked observers consensually graded the studies using 5 predetermined criteria. Radiation dose delivered to the lens and scanning time were measured for the helical and the conventional CT imaging workup. Results: Helical CT imaging scored statistically significantly better with regard to overall accuracy of foreign body localization and presence of beam-hardening streak artifacts from dental fillings. Conventional CT scored significantly better with regard to stair-step artifacts. The radiation dose delivered to the lens was 35.4 mGy for helical CT imaging and 73.9 mGy for conventional CT workup (axial and coronal scanning). Total scanning time was 18 seconds for helical CT axial scanning and 104 seconds for conventional CT axial and coronal scanning. Conclusion: Helical CT is superior to conventional CT imaging, because it can provide adequate information about orbital metallic foreign bodies with a single acquisition, thus reducing both the number of examinations and the radiation exposure for the patient.

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“…For intraocular foreign bodies, helical CT was found to be equal to conventional CT with regard to diagnostic accuracy ( Chacko et al 1997;Lakits et al 1998aLakits et al , 1998b.…”

mentioning

confidence: 99%

Helical and conventional CT in the imaging of metallic foreign bodies in the orbit

Lakits¹,

Prokesch

Scholda³

et al. 2000

Acta Ophthalmologica Scandinavica

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“…Overestimation of the size of metallic intraocular foreign bodies, on soft tissue window settings, is a wellknown phenomenon caused by the great difference in density between metal and intraorbital soft tissues [9,10,11]. The difference in measurements between soft tissue and bone window settings ranged 28±86 % (mean 57 %) and the bone window setting measurements were closer to surgical findings in all cases (Fig.…”

Section: Discussionmentioning

confidence: 61%

“…Helical CT has overcome this problem, because high-quality reconstructed images can be obtained from the data set in the axial plane [9,10,11,12]. Spatial resolution and quality of reconstructed images is dependent on collimation and reconstruction index.…”

Section: Discussionmentioning

confidence: 99%

“…Multiplanar reconstruction (MPR) images of similar high quality were also obtained in models of metallic and non-metallic intraocular foreign bodies [10]. Moreover, a clinical study showed that helical-CT multiplanar imaging offers significant advantages, compared with conventional CT, for the preoperative assessment of metallic intraocular foreign bodies, including shortened examination time, reduced radiation exposure and the ability to obtain images in any plane without the need for additional scanning [11].…”

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confidence: 85%

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Assessment of intraocular foreign bodies by helical-CT multiplanar imaging

et al. 2001

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The aim of this study was to examine the effectiveness of helical CT in the assessment of intraocular foreign bodies, evaluating two protocols with different collimation. We performed helical-CT studies in 30 patients. Fifteen patients were examined with 1.5-mm collimation and the other 15 patients with 3.0-mm collimation. All other imaging parameters were identical in both protocols. Multiplanar images were reconstructed. The examinations were reviewed for presence, localization and size of intraocular foreign bodies. We compare our results with the surgical data. We estimate the required examination time. In the first group (collimation 1.5 mm) an intraorbital foreign body was detected in 8 of 15 patients. In 3 of 8 patients an intraocular foreign body (all were metallic) was detected. In the second group (collimation 3.0 mm) an intraorbital foreign body was detected in 9 of 15 patients. In 8 of 9 patients an intraocular foreign body (all were metallic) was detected. Our results were confirmed by surgery in all cases. Examination time was 36 s in the first group and 18 s in the second group. Computed tomography should be considered the imaging modality of choice in the assessment of metallic intraocular foreign bodies and 3.0-mm collimation is optional, because of reduced examination time and radiation exposure.

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“…• Helical CT scanning is considered the diagnostic method of choice for the detection of intraocular foreign bodies and is preferred over both MR imaging and Sonography (3,4,5).…”

Section: Discussionmentioning

confidence: 99%