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330301

120

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A point source of 99-Tc is placed in front of a gamma camera with a parallel hole collimator. As the point source is moved away from the collimator (i.e. 5 cm to 15 cm but remain in the field of view), which of the following will happen to the count rate?

Select the correct answer(s).

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Explanation

Normally as a source of radiation is moved away from a detector, inverse square law indicates a drop off in count rate. However in the case of a collimated system, the number of collimator holes that allows events through to the crystal increases as a poi

330304

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After eluting a 99-Tc generator to the sodium pertechnetate, eluate must be assayed to determine

Select the correct answer(s).

(0/0)

330305

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Spatial resolution will ____ with increasing distance from a parallel hole collimator

Select the correct answer(s).

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Explanation

This is true for ALL collimators. The best resolution is always at the surface of the collimator

330312

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The most probable interaction of 99-Tc, 140 keV photons in fatty tissue is

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Explanation

Photoelectric is dominant below ~28 keV in soft tissue and ~48 keV for bone. Compton is most likely. For photons whose energy is less than 1.022 MeV, pair production is impossible. Complete transmission is more likely for much higher energy photons

330313

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Testing the first elution of every generator for 99-Mo ill be performed in order to assure that 99-Tc radiopharmaceuticals will contain no more than 0.15 microCi per 1 mCi of 99-Tc radiopharmaceutical at the time of _____

Select the correct answer(s).

(0/0)

330314

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The attenuation of photons in matter is a function of

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Explanation

The probability of a specific type of interaction is based on the number of protons of the matter and energy of the photon

330315

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If 99-Mo is removed from the column during the elution process, the activity is considered to be a

Select the correct answer(s).

(0/0)

330316

120

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Photons undergoing photoelectric absorption in tissue produce

Select the correct answer(s).

(0/0)

330317

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Which organ would most likely receive a dose of 0.03 rem/microCi if 99-Mo contamination from an elution was administered

Select the correct answer(s).

(0/0)

330318

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In a conventional SPECT camera, each row of pixels is used to reconstruct which of the following

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Explanation

a sinogram is a single row of pixels, repeated for each planar projection. Each sinogram is used to reconstruct a single transaxial slice

330319

120

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If you received a 40 mCi dose of FDG at 8:00 am and inject a patient at noon, how much activity would there be at the time of injection

Select the correct answer(s).

(0/0)

Explanation

The half life of 18-F is ~2 hours (110 min). So at 10 am you would have ~20 mCi and at noon, 10 mCi

330321

120

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What is the radiochemical purity needed for most 99-Tc radiopharmaceuticals

Select the correct answer(s).

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330324

120

none

In an Anger Gamma Camera, low energy electrons are ejected when light strikes the

Select the correct answer(s).

(0/0)

Explanation

In a gamma camera, the gamma rays interact with the crystal to produce light. The light then strikes the photocathode. The photocathode is negatively charged. Low energy electrons are knocked out of the photocathode by the light photons and are accelerate

330326

120

none

Which of the following radiotracers is produced by a cyclotron

Select the correct answer(s).

(0/0)

330327

120

none

Nuclear

Question 1 of 1

Time Left

A point source of 99-Tc is placed in front of a gamma camera with a parallel hole collimator. As the point source is moved away from the collimator (i.e. 5 cm to 15 cm but remain in the field of view), which of the following will happen to the count rate?

Select the correct answer(s).

(0/0)

Explanation

After eluting a 99-Tc generator to the sodium pertechnetate, eluate must be assayed to determine

Select the correct answer(s).

(0/0)

Spatial resolution will ____ with increasing distance from a parallel hole collimator

Select the correct answer(s).

(0/0)

Explanation

The most probable interaction of 99-Tc, 140 keV photons in fatty tissue is

Select the correct answer(s).

(0/0)

Explanation

Testing the first elution of every generator for 99-Mo ill be performed in order to assure that 99-Tc radiopharmaceuticals will contain no more than 0.15 microCi per 1 mCi of 99-Tc radiopharmaceutical at the time of _____

Select the correct answer(s).

(0/0)

The attenuation of photons in matter is a function of

Select the correct answer(s).

(0/0)

Explanation

If 99-Mo is removed from the column during the elution process, the activity is considered to be a

Select the correct answer(s).

(0/0)

Photons undergoing photoelectric absorption in tissue produce

Select the correct answer(s).

(0/0)

Which organ would most likely receive a dose of 0.03 rem/microCi if 99-Mo contamination from an elution was administered

Select the correct answer(s).

(0/0)

In a conventional SPECT camera, each row of pixels is used to reconstruct which of the following

Select the correct answer(s).

(0/0)

Explanation

If you received a 40 mCi dose of FDG at 8:00 am and inject a patient at noon, how much activity would there be at the time of injection

Select the correct answer(s).

(0/0)

Explanation

What is the radiochemical purity needed for most 99-Tc radiopharmaceuticals

Select the correct answer(s).

(0/0)

In an Anger Gamma Camera, low energy electrons are ejected when light strikes the

Select the correct answer(s).

(0/0)

Explanation

Which of the following radiotracers is produced by a cyclotron

Select the correct answer(s).

(0/0)

The molybdenum/technetium generator is an example of which theory of equilibrium

Select the correct answer(s).

(0/0)

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