Comparison of transabdominal ultrasound and electromagnetic transponders for prostate localization

Foster, Ryan; Solberg, Timothy D.; Li, Haisen S.; Kerkhoff, Andrew D.; Enke, Charles Arthur; Willoughby, Twyla R.; Kupelian, Patrick A.

doi:10.1120/jacmp.v11i1.2924

Cited by 20 publications

(13 citation statements)

References 29 publications

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“…In the case of radiotherapy, EM tracking is used for localization of tumors and surrounding critical structures, such as in and near the prostate [37]. Placement of feeding tubes is another application in which EM tracking is frequently used [129].…”

Section: A Range Of Applicationmentioning

confidence: 99%

“…[76] ENT surgery [InstaTrak] 4 studies, when compared to optical tracking [108]: no differences. Others without control group [41,78,184] Advantages: Accurate structure localization [78,184], fast setup time [41] Drawbacks: High costs, low availability [184] Radiotherapy [Calypso] 3 studies [37,157,193] Advantages: Better patient outcome compared to conventional radiotherapy [157] Drawbacks: High costs, lower accuracy than US localization [37], tracks position (no orientation) only of up to three sensors [104], more prospective validation is needed [90] in the field of the abdomen. Motion compensation may be beneficial in this area [198].…”

Section: Clinical Evidencementioning

confidence: 99%

See 1 more Smart Citation

Electromagnetic Tracking in Medicine—A Review of Technology, Validation, and Applications

Franz

Haidegger

Birkfellner

et al. 2014

IEEE Trans. Med. Imaging

403

273

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Abstract-Object tracking is a key enabling technology in the context of computer-assisted medical interventions. Allowing the continuous localization of medical instruments and patient anatomy, it is a prerequisite for providing instrument guidance to subsurface anatomical structures. The only widely used technique that enables real-time tracking of small objects without lineof-sight restrictions is electromagnetic (EM) tracking. While EM tracking has been the subject of many research efforts, clinical applications have been slow to emerge. The aim of this review paper is therefore to provide insight into the future potential and limitations of EM tracking for medical use. We describe the basic working principles of EM tracking systems, list the main sources of error, and summarize the published studies on tracking accuracy, precision and robustness along with the corresponding validation protocols proposed. State-of-the-art approaches to error compensation are also reviewed in depth. Finally, an overview of the clinical applications addressed with EM tracking is given. Throughout the paper, we report not only on scientific progress, but also provide a review on commercial systems. Given the continuous debate on the applicability of EM tracking in medicine, this paper provides a timely overview of the state-of-the-art in the field.

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Section: A Range Of Applicationmentioning

confidence: 99%

Section: Clinical Evidencementioning

confidence: 99%

Electromagnetic Tracking in Medicine—A Review of Technology, Validation, and Applications

Franz

Haidegger

Birkfellner

et al. 2014

IEEE Trans. Med. Imaging

403

273

View full text Add to dashboard Cite

show abstract

“…61 Numerous other groups have found significant differences in treatment setup data derived from TAUS soft-tissue assessment compared with FM data from other modalities, greater variation within ultrasound data and ultrasoundderived PTV margins may be up to 3-4 times smaller than those reported in the literature. 43,62,63 Fuller et al 61 also provide a useful narrative on the inherent difficulties of comparing IGRT modalities which briefly include the lack of an established ground truth and the statistical inaccuracies of comparing data generated by incomparable methods or devices.…”

Section: Imaging Modalitiesmentioning

confidence: 99%

Fiducial marker guided prostate radiotherapy: a review

O’Neill¹,

Jain²,

Hounsell³

et al. 2016

The British Journal of Radiology

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Image-guided radiotherapy (IGRT) is an essential tool in the accurate delivery of modern radiotherapy techniques. Prostate radiotherapy positioned using skin marks or bony anatomy may be adequate for delivering a relatively homogeneous whole-pelvic radiotherapy dose, but these surrogates are not reliable when using reduced margins, dose escalation or hypofractionated stereotactic radiotherapy. Fiducial markers (FMs) for prostate IGRT have been in use since the 1990s. They require surgical implantation and provide a surrogate for the position of the prostate gland. A variety of FMs are available and they can be used in a number of ways. This review aimed to establish the evidence for using prostate FMs in terms of feasibility, implantation procedures, types of FMs used, FM migration, imaging modalities used and the clinical impact of FMs. A search strategy was defined and a literature search was carried out in Medline. Inclusion and exclusion criteria were applied, which resulted in 50 articles being included in this review. The evidence demonstrates that FMs provide a more accurate surrogate for the position of the prostate than either external skin marks or bony anatomy. A combination of FM alignment and soft-tissue analysis is currently the most effective and widely available approach to ensuring accuracy in prostate IGRT. FM implantation is safe and well tolerated. FM migration is possible but minimal. Standardization of all techniques and procedures in relation to the use of prostate FMs is required. Finally, a clinical trial investigating a non-surgical alternative to prostate FMs is introduced.

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“…The wireless EM system has been investigated in a number of clinical trials for real-time motion compensation, e.g. in prostate and liver SBRT [7,8].…”

Section: Simultaneous Acquisitionmentioning

confidence: 99%

“…[3]- [5], in-vivo validation of real-time target localization remains challenging due to the difficulty to obtain a reliable ground truth. So far, this has either been restricted by the inter-and intra-observer variability of manual annotations, which are difficult to obtain in ultrasound volumes [6], or been limited to static scenarios where the setup accuracy of ultrasound is compared to another target localization modality [5,7].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous acquisition of 4D ultrasound and wireless electromagnetic tracking for in-vivo accuracy validation

Ipsen

Bruder

Worm

et al. 2017

Current Directions in Biomedical Engineering

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Ultrasound is being increasingly investigated for real-time target localization in image-guided interventions. Yet, in-vivo validation remains challenging due to the difficulty to obtain a reliable ground truth. For this purpose, real-time volumetric (4D) ultrasound imaging was performed simultaneously with electromagnetic localization of three wireless transponders implanted in the liver of a radiotherapy patient. 4D ultrasound and electromagnetic tracking were acquired at framerates of 12Hz and 8Hz, respectively, during free breathing over 8 min following treatment. The electromagnetic antenna was placed directly above and the ultrasound probe on the right side of the patient to visualize the liver transponders. It was possible to record 25.7 s of overlapping ultrasound and electromagnetic position data of one transponder. Good spatial alignment with 0.6 mm 3D root-mean-square error between both traces was achieved using a rigid landmark transform. However, data acquisition was impaired since the electromagnetic tracking highly influenced the ultrasound equipment and vice versa. High intensity noise streaks appeared in the ultrasound scan lines irrespective of the chosen frequency (1.7-3.3 MHz, 2/4 MHz harmonic). To allow for target visualization and tracking in the ultrasound volumes despite the artefacts, an online filter was designed where corrupted pixels in the newest ultrasound frame were replaced with non-corrupted pixels from preceding frames. Aside from these artefacts, the recorded electromagnetic tracking data was fragmented and only the transponder closest to the antenna could be detected over a limited period of six consecutive breathing cycles. This problem was most likely caused by interference from the metal holder of the ultrasound probe and was solved in a subsequent experiment using a 3D-printed non-metal probe fixation. Real-time wireless electromagnetic tracking was compared with 4D ultrasound imaging in-vivo for the first time. For stable tracking, large metal components need to be avoided during data acquisition and ultrasound filtering is required.

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Comparison of transabdominal ultrasound and electromagnetic transponders for prostate localization

Cited by 20 publications

References 29 publications

Electromagnetic Tracking in Medicine—A Review of Technology, Validation, and Applications

Electromagnetic Tracking in Medicine—A Review of Technology, Validation, and Applications

Fiducial marker guided prostate radiotherapy: a review

Simultaneous acquisition of 4D ultrasound and wireless electromagnetic tracking for in-vivo accuracy validation

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