Question 1

Describe briefly the functions of the gamma camera.

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Question 2

A gamma camera is used to examine the rates at which radionuclides are accumulated in or eliminated from an organ.

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A gamma camera is used in nuclear medicine to capture and create images from the gamma radiation emitted by radionuclides that have been introduced into a patient's body, allowing for the examination of organ function and the rates at which these radionuclides are accumulated in or eliminated from organs.

Question 3

Describe briefly the function of a pulse height analyzer in a gamma camera.

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Question 4

A cyclotron with a proton current of I = 2 × 10¹⁴ protons/s is used to irradiate a target with n = 3 × 10²⁰ neutrons in order to produce N-13 (T_1/2 = 10 min). The cross-section for the reaction is ó = 3 × 10^-26 cm². Calculate the number of N-13 nuclei after 30 minutes of irradiation.

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Question 5

Describe the photoelectric effect and its use in nuclear imaging.

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Question 6

A cyclotron with a proton current of I = 1.5 × 10¹⁴ protons/s is used to irradiate a target with n = 10¹⁸ neutrons/cm² in order to produce C-11 (T_1/2 = 20 min). The cross-section for the reaction is ó = 3 × 10^-26 cm². Calculate the activity after one hour of irradiation.

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Question 7

The number of visible light photons produced from gamma radiation is proportional to the energy of the original incoming gamma ray.

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The energy of the original gamma ray determines the number of interactions it can have with matter, which in turn affects the number of visible light photons produced through processes like scintillation.

Question 8

What is the ratio of Bi-210 to Pb-210 activities at secular equilibrium? The half-life of Bi-210 is 5 days, and that of Pb-210 is 22.6 years.

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Question 9

What is the limitation of a standard gamma camera, and which method is used to overcome this limitation?

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Question 10

The gamma camera produces a three-dimensional image from various angles.

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A gamma camera primarily produces two-dimensional images. Three-dimensional images can be constructed from multiple two-dimensional images using techniques like SPECT (Single Photon Emission Computed Tomography), but the basic operation of a gamma camera itself is to capture two-dimensional images.

Question 11

Describe the two steps of radiation detection in nuclear medicine.

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Question 12

¹³¹I is used in a scan. If its half-life is 8.1 days, how long will it take for its activity to drop to 1% of its initial value?

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Question 13

In thyroid scans, ¹²³I is used. Its daughter nucleus is stable. How long will it take until the amount of ¹²³I left is 5% of the original amount? The half-life of ¹²³I is 13 hours.

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Question 14

How is technetium used in the diagnosis of metastatic deposits in bones in some forms of cancer?

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Quiz 25: Diagnostic Nuclear Medicine Imaging