A patient is to be treated in the room shown in the figure. (b) Assume the tumou

Question

A patient is to be treated in the room shown in the figure. (b) Assume the tumour to be treated has a ?-coefficient that is very small such that it can be safely ignored (this actually turns out to be a reasonable assumption in certain types of turnours), and that the prescribed dose to cure it is 31 Gy. Tumour "cure" is defined in this case as the killing of 99.99% of the malignant cells. compute alpha  for this tumour (in Gy^-1)

A patient is to be treated in the room shown in the figure. (a) Identify the type of treatment the patient is to receive. chemotherapy external-beam radiotherapy brachytherapy Identify the main components of the equipment seen in the room. (Select all that apply) patient treatment table a X-ray tube afterloader Co-60 unit n linac X-ray detector (b) Assume the tumour to be treated has a ?-coefficient that is very small such that it can be safely ignored (this actually turns out to be a reasonable assumption in certain types of turnours), and that the prescribed dose to cure it is 31 Gy. Tumour "cure" is defined in this case as the killing of 99.99% of the malignant cells. compute ? for this tumour (in Gy- Gy

Explanation / Answer

Answer

The patient to receive chemotherapy requires monitor, CBC and blood bank.Brachytherapy is also an internal radiation therapy which requires a shielded room, dosimetry and physics area, source preparation, source storage and nurse station.External beam therapy is also radiation therapy which uses a linear accelerator.

Gy is the derived unit. It is the symbol of gray, used to measure ionizing radiation dose.

a. From the above explanation, it is observed that the given type of treatment is brachytherapy.

b. Patient treatment table

X-ray tube

After loader

x-ray detector

c. Tumor cure is the killing of malignant cells up to 99.99%. The prescribed dose is 31 Gy.

The tumor to be treated has a diffusion coefficient that is very small and ignored safely. This coefficient for this tumor can be calculated using the effective dosage formula.

E= nd (a +bd)

Where, E = effect of dose, 99.99%

n = fraction of dose

d = dose/fraction

n.d = total dose

here, b is negligible.

Substituting the values,

                         a = 99.99/100 divide by 3100

                            = 0.032Gy

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