On the question of 3D seed reconstruction in prostate brachytherapy: The determination of x-ray source and film locations

Mutian Zhang, Marco Zaider, Michael Worman, Gilad Cohen

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Inaccuracy in seed placement during permanent prostate implants may lead to significant dosimetric deviations from the intended plan. In two recent publications (Todor et al 2002 Phys. Med. Biol. 47 2031-48, Todor et al 2003 Phys. Med. Biol. 48 1153-71), methodology was described for identifying intraoperatively the positions of seeds already implanted, thus allowing re-optimization of the treatment plan and correcting for such seed misplacement. Seed reconstruction is performed using fluoroscopic images and an important (and non-trivial) component of this approach is the ability to accurately determine the position of the gantry relative to the treatment volume. We describe the methodology for acquiring this information, based on the known geometry of six markers attached to the ultrasound probe. This method does not require the C-arm unit to be isocentric and films can be taken with the gantry set at any arbitrary position. This is significant because the patient positioning on the operating table (in the lithotomy position) restricts the range of angles at which films can be taken to a quite narrow (typically ± 10°) interval and, as a general rule, the closer the angles the larger the uncertainty in the seed location reconstruction along the direction from the x-ray source to the film.

Original languageEnglish (US)
Pages (from-to)N335-N345
JournalPhysics in medicine and biology
Volume49
Issue number19
DOIs
StatePublished - Oct 7 2004

Fingerprint

x ray sources
Brachytherapy
Seed
seeds
Prostate
Seeds
X-Rays
X rays
gantry cranes
Operating Tables
methodology
Patient Positioning
markers
positioning
Uncertainty
Ultrasonics
intervals
deviation
optimization
Geometry

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

Cite this

On the question of 3D seed reconstruction in prostate brachytherapy : The determination of x-ray source and film locations. / Zhang, Mutian; Zaider, Marco; Worman, Michael; Cohen, Gilad.

In: Physics in medicine and biology, Vol. 49, No. 19, 07.10.2004, p. N335-N345.

Research output: Contribution to journalArticle

Zhang, Mutian ; Zaider, Marco ; Worman, Michael ; Cohen, Gilad. / On the question of 3D seed reconstruction in prostate brachytherapy : The determination of x-ray source and film locations. In: Physics in medicine and biology. 2004 ; Vol. 49, No. 19. pp. N335-N345.
@article{72c82ab5a32e423d9e30a4e0da3de15b,
title = "On the question of 3D seed reconstruction in prostate brachytherapy: The determination of x-ray source and film locations",
abstract = "Inaccuracy in seed placement during permanent prostate implants may lead to significant dosimetric deviations from the intended plan. In two recent publications (Todor et al 2002 Phys. Med. Biol. 47 2031-48, Todor et al 2003 Phys. Med. Biol. 48 1153-71), methodology was described for identifying intraoperatively the positions of seeds already implanted, thus allowing re-optimization of the treatment plan and correcting for such seed misplacement. Seed reconstruction is performed using fluoroscopic images and an important (and non-trivial) component of this approach is the ability to accurately determine the position of the gantry relative to the treatment volume. We describe the methodology for acquiring this information, based on the known geometry of six markers attached to the ultrasound probe. This method does not require the C-arm unit to be isocentric and films can be taken with the gantry set at any arbitrary position. This is significant because the patient positioning on the operating table (in the lithotomy position) restricts the range of angles at which films can be taken to a quite narrow (typically ± 10°) interval and, as a general rule, the closer the angles the larger the uncertainty in the seed location reconstruction along the direction from the x-ray source to the film.",
author = "Mutian Zhang and Marco Zaider and Michael Worman and Gilad Cohen",
year = "2004",
month = "10",
day = "7",
doi = "10.1088/0031-9155/49/19/N03",
language = "English (US)",
volume = "49",
pages = "N335--N345",
journal = "Physics in Medicine and Biology",
issn = "0031-9155",
publisher = "IOP Publishing Ltd.",
number = "19",

}

TY - JOUR

T1 - On the question of 3D seed reconstruction in prostate brachytherapy

T2 - The determination of x-ray source and film locations

AU - Zhang, Mutian

AU - Zaider, Marco

AU - Worman, Michael

AU - Cohen, Gilad

PY - 2004/10/7

Y1 - 2004/10/7

N2 - Inaccuracy in seed placement during permanent prostate implants may lead to significant dosimetric deviations from the intended plan. In two recent publications (Todor et al 2002 Phys. Med. Biol. 47 2031-48, Todor et al 2003 Phys. Med. Biol. 48 1153-71), methodology was described for identifying intraoperatively the positions of seeds already implanted, thus allowing re-optimization of the treatment plan and correcting for such seed misplacement. Seed reconstruction is performed using fluoroscopic images and an important (and non-trivial) component of this approach is the ability to accurately determine the position of the gantry relative to the treatment volume. We describe the methodology for acquiring this information, based on the known geometry of six markers attached to the ultrasound probe. This method does not require the C-arm unit to be isocentric and films can be taken with the gantry set at any arbitrary position. This is significant because the patient positioning on the operating table (in the lithotomy position) restricts the range of angles at which films can be taken to a quite narrow (typically ± 10°) interval and, as a general rule, the closer the angles the larger the uncertainty in the seed location reconstruction along the direction from the x-ray source to the film.

AB - Inaccuracy in seed placement during permanent prostate implants may lead to significant dosimetric deviations from the intended plan. In two recent publications (Todor et al 2002 Phys. Med. Biol. 47 2031-48, Todor et al 2003 Phys. Med. Biol. 48 1153-71), methodology was described for identifying intraoperatively the positions of seeds already implanted, thus allowing re-optimization of the treatment plan and correcting for such seed misplacement. Seed reconstruction is performed using fluoroscopic images and an important (and non-trivial) component of this approach is the ability to accurately determine the position of the gantry relative to the treatment volume. We describe the methodology for acquiring this information, based on the known geometry of six markers attached to the ultrasound probe. This method does not require the C-arm unit to be isocentric and films can be taken with the gantry set at any arbitrary position. This is significant because the patient positioning on the operating table (in the lithotomy position) restricts the range of angles at which films can be taken to a quite narrow (typically ± 10°) interval and, as a general rule, the closer the angles the larger the uncertainty in the seed location reconstruction along the direction from the x-ray source to the film.

UR - http://www.scopus.com/inward/record.url?scp=5744246767&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=5744246767&partnerID=8YFLogxK

U2 - 10.1088/0031-9155/49/19/N03

DO - 10.1088/0031-9155/49/19/N03

M3 - Article

C2 - 15552426

AN - SCOPUS:5744246767

VL - 49

SP - N335-N345

JO - Physics in Medicine and Biology

JF - Physics in Medicine and Biology

SN - 0031-9155

IS - 19

ER -