intro to SRS & SBRT & gamma knife
___________ = a method in neurosurgery and neurological research for locating points
within the brain using an external beam, 3D frame of reference usually based on the Cartesian
coordinate system -
defines stereotactic
why do we typically use an external frame for SRT? -
The idea of SRT is that by using a known external frame, we can more accurately
position the patient for treatment!
the following defines what type of radiation therapy technique?
•a type of radiation therapy where very high doses of radiation are delivered in few fractions
(1-5).
•Also typically delivered in multiple non-coplanar beams -
SRT
SRT is typically delivered how? -
typically delivered in multiple non-coplanar beams
the following defines what type of radiation therapy technique?
•an SRT treatment of intercranial targets
•Brain only -
SRS (Stereotactic Radiosurgery)
the following defines what type of radiation therapy technique?
•SRT treatment of the body (i.e. not the brain)
Spine*, Lungs, other sites -
SBRT (Stereotactic Body Radiotherapy)
Depending on who you ask, SRT of the ______ could be considered SRS or SBRT. -
spine
why do we use term "surgery" in SRS? (Stereotactic Radiosurgery) -
•because it can be though of as a type of surgical procedure where the scalpel is
replaced with radiation... JUST SOOO PRECISE like using a scalpel
Very high doses of radiation are used to cause "________," which destroys the ability of the
target to function or grow -
ablation
what does "ablation" do to the target? -
destroys the ability of the target to function or grow
******
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, describe difference between the dose/fractions of 3D/IMRT and SBRT -
3D/IMRT dose/fractions is around = 1.8-3 Gy in 10-30 fracs
SBRT dose/fraction is around = 6-30 Gy in 1-5 fracs
describe difference between the 1. maintenance of high spatial targeting accuracy for entire
trt and 2. need for respiratory motion management
of high of 3D/IMRT and SBRT -
3D/IMRT - 1. moderately enforced
2. moderate - must at least be considered (SOMETIMES)
SBRT - 1. strictly enforced
2. highest (YES)
what do we treat with SRS? -
-functional disorders
-Arteriovenous Malformations
-tumors
what type of functional disorders can be treated with SRS? -
•Trigeminal Neuralgia
•Parkinson's Disease
•Epilepsy
what is "Arteriovenous Malformations" -
Tangle of blood vessels in the brain where arteries connect directly to veins instead
of through capillary beds
can be treated with SRS
what are main tumors treated with SRS? and where are they located? -
LOCATED IN BRAIN (always)
-Acoustic neuromas
-Meningiomas
-Pituitary adenomas
-Metastatic Brain Lesions (Mets)
-Primary Malignant Tumors
what do we treat with SBRT? (5) -
Tumors!
•Liver
•Lung
•Prostate
•Kidney
•Pancreas
2|Page
___________ = a method in neurosurgery and neurological research for locating points
within the brain using an external beam, 3D frame of reference usually based on the Cartesian
coordinate system -
defines stereotactic
why do we typically use an external frame for SRT? -
The idea of SRT is that by using a known external frame, we can more accurately
position the patient for treatment!
the following defines what type of radiation therapy technique?
•a type of radiation therapy where very high doses of radiation are delivered in few fractions
(1-5).
•Also typically delivered in multiple non-coplanar beams -
SRT
SRT is typically delivered how? -
typically delivered in multiple non-coplanar beams
the following defines what type of radiation therapy technique?
•an SRT treatment of intercranial targets
•Brain only -
SRS (Stereotactic Radiosurgery)
the following defines what type of radiation therapy technique?
•SRT treatment of the body (i.e. not the brain)
Spine*, Lungs, other sites -
SBRT (Stereotactic Body Radiotherapy)
Depending on who you ask, SRT of the ______ could be considered SRS or SBRT. -
spine
why do we use term "surgery" in SRS? (Stereotactic Radiosurgery) -
•because it can be though of as a type of surgical procedure where the scalpel is
replaced with radiation... JUST SOOO PRECISE like using a scalpel
Very high doses of radiation are used to cause "________," which destroys the ability of the
target to function or grow -
ablation
what does "ablation" do to the target? -
destroys the ability of the target to function or grow
******
1|Page
, describe difference between the dose/fractions of 3D/IMRT and SBRT -
3D/IMRT dose/fractions is around = 1.8-3 Gy in 10-30 fracs
SBRT dose/fraction is around = 6-30 Gy in 1-5 fracs
describe difference between the 1. maintenance of high spatial targeting accuracy for entire
trt and 2. need for respiratory motion management
of high of 3D/IMRT and SBRT -
3D/IMRT - 1. moderately enforced
2. moderate - must at least be considered (SOMETIMES)
SBRT - 1. strictly enforced
2. highest (YES)
what do we treat with SRS? -
-functional disorders
-Arteriovenous Malformations
-tumors
what type of functional disorders can be treated with SRS? -
•Trigeminal Neuralgia
•Parkinson's Disease
•Epilepsy
what is "Arteriovenous Malformations" -
Tangle of blood vessels in the brain where arteries connect directly to veins instead
of through capillary beds
can be treated with SRS
what are main tumors treated with SRS? and where are they located? -
LOCATED IN BRAIN (always)
-Acoustic neuromas
-Meningiomas
-Pituitary adenomas
-Metastatic Brain Lesions (Mets)
-Primary Malignant Tumors
what do we treat with SBRT? (5) -
Tumors!
•Liver
•Lung
•Prostate
•Kidney
•Pancreas
2|Page
