Srs Treatment in Delhi
Srs Treatment Doctor In India
Top Srs Treatment Delhi
Brain Tumors Primary brain tumors
» Tumors that originate in the brain
– Malignant (cancerous) or benign Metastatic brain tumors
» Malignant cells have spread from elsewhere
Brain Tumor Treatment India
History of Linear Accelerator
Based Radiosurgery Early reports of linac-based radiosurgery
with stereotactic frames in 1980’s Winston and Lutz published their results
from Joint Center for Radiation Therapy in Boston in 1986
Early linac treatments required attachment of circular collimators to standard linacs
Some relied on inherent precision of the linac, others used high precision floor
mounts, Radionics, Leibinger and Fischer, Philips,
others began commercial distribution of add-on accessories in 1990s
Accuray CyberKnife: Robotic Arm and 6MV Linac
Industrial robot arm with 6MV. Xband linac.
Two orthogonal ceiling mounted. X-rays with floor mounted flat panel detectors
Infrared. positioning Extracrania capability
Radiologist India
Recommendations for New Radiosurgery Programs:
Rigorous acceptance testing of new
equipment
Detailed small field dosimetry by Qualified Medical Physicist
Detailed investigation of accuracy and limitations of all imaging equipment:
CT, MR, angio
Careful examination of all systematic errors
Rigorous training for all staff members
Failures of Quality Assurance
U.S. NRC issued NUREG “Medical Misadministrations Caused by Human Errors in Gamma Stereotactic
Radiosurgery” in 1993 Listed 15 known misadministration reports: wrong
helmet, wrong coordinates, wrong side, wrong patient, shots repeated or skipped, failure to enter
intended radiation dose (treated w nominal dose)
Gamma Knife Center reported to CDRH accidental administration up to 52% overdose to
77 patients in 2004-2005 due to miscalibration
Linac radiosurgery center in Florida mistakenly loaded wrong factor in initial calibration, accidentally
over-dosed 10 patients Death reported to FDA in Sep 2006 from linac
radiosurgery: failure to attach accessory cone mount
Localization
The problem with radiotherapy is… We are treating something we can’t see with
something we can’t see!
Need to know where the target is relative to something we can see
Stereotactic techniques utilize a visible reference frame that is fixed relative to the
target
» Traditionally a frame screwed to the head
» Can also be an image whose location is
known relative to the treatment machine
MRI Image Distortion Problems
Image distortions of up to 9mm reported Some sequences notorious: particularly
coronal or axial acquisitions
MRI image problems extremely scanner dependent
Some scanners exhibit severe metal artifacts
Vital to work with MRI expert and manufacturers engineer
Email Us: admin@radiotherapy.in
Know More: http://oncocare.in/srs.html
No comments:
Post a Comment