It is possible to use an alternative type of radiotherapy, which is known as afterloading (a version of brachytherapy) when it is difficult to access the diseased cells directly. Tungsten alloy brachytherapy technique consists of implanting a radioactive seed inside the patient's body, via a catheter. Before and after treatment the seed is kept in a large tungsten safe, tungsten alloy radiation shielding is used to protect the patient and medical staff against radiation in the treatment. Chinatungsten is a professional tungsten alloy products manufacturer who can provide all kinds of tungsten alloy radiation shielding products used in the technique.
Tungsten Alloy Brachytherapy Shielding
When it is difficult to access the diseased cells directly, it is possible to use an alternative type of radiotherapy, known as afterloading (a version of brachytherapy shielding). This technique consists of implanting a radioactive seed inside the patient's body, via a catheter. Before and after treatment the seed is kept in a large tungsten safe, to protect the patient and medical staff against radiation.
Tungsten Alloy Brachytherapy Shielding Purpose
Tungsten alloy brachytherapy shielding is an integral part of the treatment regimen for cervical cancer and, generally, outcome in terms of local disease control and complications is a function of dose to the disease bed and critical structures, respectively. Therefore, it is paramount to accurately determine the dose given via brachytherapy to the tumor bed as well as critical structures.
Why Use Tungsten Alloy Brachytherapy Shielding?
Compared to traditional radiation shielding materials such as lead and boron carbide, tungsten alloy shielding provides excellent density with small capacity. At the same weights high density alloy can provide the same energy absorption as lead using 1/3 less material.
When the weight is certain, more density, denser, and the thickness would be thinner. Tungsten alloy brachytherapy shielding could be made with thinner thickness but high absorption of radiation in high density. That is why tungsten alloy material is suitable for radiation shielding. Tungsten alloy brachytherapy shielding is better than lead materials for it is non-toxic.
During design of tungsten alloy shielding, it is calculated according to requirements of shield to abate the multiple shielding materials' thickness.
Formula: K = e0.693 d / △1/2
K: Shield weakened multiple
△ 1/2: The shielding material of the half-value layer values
d: Shielding thickness, with the half-value layer thickness of their units, you need to half-value layer thickness of the quality of translation into the thickness of the material, divided by the density of the material can be obtained.
Utilizing an S&S imaging method in conjunction with prototype applicators that feature movable interovoid shields, they were able to acquire artifact-free image sets in a clinically applicable geometry. MR images were acquired of a phantom applicator that contained shields composed of a novel tungsten alloy. Artifacts were largely limited to regions within the ovoid cap and are of no clinical interest. The second generation A3 utilizes this material for interovoid shielding.