Mar 30, 2023
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Image of comparison between X-ray with Bragg peak
Comparison between X-ray with bragg peak in medulloblastoma
c. IMRT
d. VMAT
e. IGRT
f. Gamma knife
g. Cyberknife
h. NCT
1. Repair
2. Reoxygenation
3. Redistribution
4. Repopulation
5. Intrinsic Radiosensitivity
6. Reactivation of the immune response
Standard
Hyperfractionated
Hypofractionated
Craniospinal Irradiation
In this blog, you’ll get a brief overview of this important radiology topic for NEET PG exam preparation. Read on.
Golden Points Disadvantage of Teletherapy as compared to Brachytherapy is the beam coming from outside, the target part along with adjacent parts are also exposed Brachytherapy reduces the risk of exposure of adjacent parts to radiation. In Teletherapy, Cobalt machine and LINAC (Linear Accelerator) are used. |
Remember Whole body EBRT is used in Mycosis fungoides. |
Isotope Uses Half-life Iodine-123 Diagnosis 13 hours Iodine-125 Permanent implant in Ca Prostate 60 days Iodine-131 Systemic Brachytherapy (Grave’s disease, Thyroid cancer) 8 days Technetium-99m Diagnostic radioisotope in Scintigraphy 6 hours Fluorine-18 Diagnostic radioisotope in PET 2 hours (110 mins) Radium-226 1600 years Cesium-137 30 years Cobalt-60 5.26 years Iridium-192 74.2 days Iodine-125 Permanent implant in Ca Prostate 60.2 days Golden Points
I-127 is a naturally occurring radioisotope and has no radioactivity.
Radium-226, has the highest half-life.
First radioisotope used in humans was Radium-226.
It produces Radon (decay compound), which causes carcinoma of lungs.
It emits alpha, beta, gamma rays.
Also Read: NEET PG: High-Yield Topics For Radiology
Image of 3DCRT, IMRT, VMAT, IGRT 21.55 mins
Gamma knife
Also Read: Musculoskeletal Radiology: Bone Tumors
Golden Point: Oxygen acts as a Radiosensitizer. |
To Remember: Anthracyclines may show radiation recall syndrome |
Golden Points M-phase (dividing phase) is most radiosensitive phase S-phase (Synthesizing phase) is most radioresistant phase |
Golden points
|
Also Read: Why is Radiology the most preferred branch?
Ans: LINAC produces X-rays and electrons.
Ans: Electron beam or ortho voltage, as it has less penetration power.
Ans: Brachytherapy
Ans: Phosphorus 32 (P32), Strontium, Yttrium.
Ans: Proton beam
Ans: C I G Y R P
Ans: Nervous tissue
Ans: Growth hormone
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