1. Contact therapy machines operate at potential - (i) 20 KV (ii) 50-150 KV (iii) 40-50 KV (iv) 200-300 KV 2. Superficial therapy is given at potential - (i) 200-300 KV (ii) 50-150... 1. Contact therapy machines operate at potential - (i) 20 KV (ii) 50-150 KV (iii) 40-50 KV (iv) 200-300 KV 2. Superficial therapy is given at potential - (i) 200-300 KV (ii) 50-150 KV (iii) 500-1000 KV (iv) 40-50 KV 3. In radiotherapy, a cyclotron is used to produce - (i) high energy proton beam (ii) high energy photon (iii) neutron beam (iv) none of these 4. Cobalt-60 is produced by bombarding neutron to - (i) Ni-59 (ii) Co-59 (iii) Co-61 (iv) Ni-60 5. The end product of Co-60 decay is - (i) Ni-60 (ii) Co-59 (iii) Co-61 (iv) Ni-59 6. With ortho-voltage machine, tumor can be treated up to the depth of - (i) 1cm (ii) 2cm (iii) 3cm (iv) 0.5cm 7. The velocity of sound in medium depends on compressibility as - (i) directly (ii) inversely (iii) inverse squarely (iv) independent 8. Decibel is the unit of - (i) relative intensity of sound (ii) speed of sound (iii) amplitude (iv) frequency 9. The main component of ultrasound transducer is - (i) silver electrode (ii) backing block (iii) piezo-electric crystal (iv) none of these 10. Sonic beam used in diagnostic imaging have frequencies - (i) 1-15 KHz (ii) 15-20 KHz (iii) 20-30 MHz.
Understand the Problem
The question is presenting a series of multiple-choice questions related to radiotherapy, ultrasound, and physical principles in medical applications. Each item asks for specific information about concepts like the potentials used in therapy machines, isotopes, and properties of sound in a medium.
Answer
40-50 KV, 50-150 KV, high energy proton beam, Co-59, Ni-60, 2cm, inversely, relative intensity of sound, piezo-electric crystal, 20-30 MHz.
The answers are: (a) 40-50 KV, (b) 50-150 KV, (c) high energy proton beam, (d) Co-59, (e) Ni-60, (f) 2cm, (g) inversely, (h) relative intensity of sound, (i) piezo-electric crystal, (j) 20-30 MHz
Answer for screen readers
The answers are: (a) 40-50 KV, (b) 50-150 KV, (c) high energy proton beam, (d) Co-59, (e) Ni-60, (f) 2cm, (g) inversely, (h) relative intensity of sound, (i) piezo-electric crystal, (j) 20-30 MHz
More Information
Contact therapy operates at low voltages like 40-50 kV to target superficial lesions. Cobalt-60, used in radiotherapy, is artificially produced, and its decay results in a more stable form.
Tips
Common mistake is misunderstanding the potentials used in different therapy types; careful reading of specifications is necessary.
Sources
- Clinical Radiation Generators | Radiology Key - radiologykey.com
- RADIATION GENERATORS - AAPM - aapm.org
- External beam radiation therapy with kilovoltage x-rays - physicamedica.com
