A general approach to the location of radiopaque objects, with applications in radiotherapy

Christopherson, D.; Jones, David W.

doi:10.1088/0031-9155/29/12/011

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…However, identification of the images of a specific source on two orthogonal views of an implant containing 50-100 sources is a difficult task. Therefore, several improved methods [4][5][6][7][8][9][10][11][12][13][14] of seed localization have also been developed. Recently, as computed tomography ͑CT͒ scans become more and more popular, methods 4,[15][16][17][18][19] have been developed to localize radioactive sources directly from either a stack of contiguous CT transverse scans or scout scans of CT.…”

Section: Introductionmentioning

confidence: 99%

Combined use of transverse and scout computed tomography scans to localize radioactive seeds in an interstitial brachytherapy implant

et al. 1999

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Various techniques have been developed to localize radioactive sources in brachytherapy implants. The most common methods include the orthogonal film method, the stereo-shift film method, and recently, direct localization from a series of contiguous CT transverse images. The major advantage of the CT method is that it provides the seed locations relative to anatomic structures. However, it is often the case that accurate identification and localization of the sources become difficult because of partial source artifacts in more than one transverse cut and other artifacts on CT images. A new algorithm has been developed to combine the advantages of using a pair of orthogonal scout views with the advantages of using a stack of transverse cuts. In the new algorithm, a common reference point is used to correlate CT transverse images and two orthogonal scout CT scans (AP and lateral). The radioactive sources are localized on CT transverse images. At the same time, the sources are displayed automatically on the two CT scout scans. In this way, the individual sources can be clearly distinguished and ambiguities arising from partial source artifacts are resolved immediately. Because of the finite slice thickness of transverse cuts, the longitudinal coordinates are more accurately obtained from the scout views. Therefore, the longitudinal coordinates of seeds localized on the transverse cuts are adjusted so that they match the position of the seeds on scout views. The algorithm has been tested on clinical cases and has proved to be a time saving and accurate method.

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Section: Introductionmentioning

confidence: 99%

Combined use of transverse and scout computed tomography scans to localize radioactive seeds in an interstitial brachytherapy implant

et al. 1999

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“…Efforts have been made to develop more efficient techniques for source localization. [1][2][3][4][5][6][7][8][9][10][11][12][13] Three film techniques have been used with some success in automated seed matching. [1][2][3][4] However, difficulties still persist with the various approaches to resolve ambiguous seed matches.…”

Section: Introductionmentioning

confidence: 99%

“…Several methods using two films with different remarkable features have also been proposed. [6][7][8][9][10][11][12] Recently, a new source localization algorithm has been developed by Li et al 13 In this approach, the 3-D source location is reconstructed based on a pair of radiographs, with the assumption that the ribbon/ needle image curve can be approximated by one linearquadratic equation. However, as indicated by the authors, this could potentially cause problems.…”

Section: Introductionmentioning

confidence: 99%

A method for more efficient source localization of interstitial implants with biplane radiographs

et al. 1997

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The conventional method for source localization in an interstitial ribbon implant by means of biplane radiographs can be difficult, especially when a large number of seeds are involved. We present a new algorithm for more efficient source localization with the same conventional biplane radiographs. The method does not require a one-to-one source correspondence between two radiographs. The user needs only to digitize several points, following the shape of each ribbon from both films. The points that are digitized do not need to be the location of the seeds, and they do not have to correspond to the same points on both films. The algorithm uses the multidimensional minimization method to reconstruct the three-dimensional locus of the ribbon. The location of each seed is then determined by its pathlength relative to the corresponding starting point. We have used phantom experiments and clinical cases to test the reliability of the algorithm. The results show that the errors in the determination of seed locations are less than 2 mm, and the efficiency in source digitization for data entry can be increased by a factor up to 5. © 1997 American Association of Physicists in Medicine. ͓S0094-2405͑97͒01608-8͔

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The incorporation of partial shielding of the spinal cord in a tissue deficit compensator in radiotherapy of the thorax

Jones¹,

Christopherson²,

Judd³

et al. 1995

Medical Dosimetry

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A general approach to the location of radiopaque objects, with applications in radiotherapy

Cited by 4 publications

References 2 publications

Combined use of transverse and scout computed tomography scans to localize radioactive seeds in an interstitial brachytherapy implant

Combined use of transverse and scout computed tomography scans to localize radioactive seeds in an interstitial brachytherapy implant

A method for more efficient source localization of interstitial implants with biplane radiographs

The incorporation of partial shielding of the spinal cord in a tissue deficit compensator in radiotherapy of the thorax

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