Nuclear 3

nuclear-3

Saída

Questão 1 of 1

Tempo Restante

330510

120

block

A single day mibi rest/stress SPECT MPI was performed using new reduced count density software. Resting activity administered was 6 mCi and a 12-min SPECT acquisition was performed. The most appropriate subsequent stress activity and acquisition time are

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Explicação

Irrespective of soft/hardware, for a single day rest/stress protocol, the injected activity ratio should be 3:1 or greater to prevent rest-to-stress "shine-through"

330511

120

none

For a two-day stress/rest mibi protocol, both the stress and rest SPECT acquisitions were gated. Both the stress and rest perfusion images were normal. The following functional parameters were determined: Rest EDV 95 cc, ESV 37 cc, EF 61%; Stress EDV 96 cc, ESV 45 cc, EF 53%

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Explicação

An incr in ESV and decr in EF during stress that persists at the time of post-stress SPECT acquisition suggests post-stress stunning. With normal perfusion, this is most compatible with stress induced severe balanced ischemia

330512

120

none

In a gated perfusion SPECT scan considerable variation in the R-R intervals of the accepted cardiac cycles occurred. From reconstructed gated images which portion of the LV volume curve will be most likely affected

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Explicação

An avg R-R interval for the pt is determined immed prior to SPECT image acquisition. Beats within that avg R-R interval +/- 50% are accepted. With gating, volume curves for each of the acquired cardiac cycles are initiated at the R wave. Accepted beats th

330514

120

none

Which of the following parameters are more easily quantified with gated blood pool SPECT but not with equilibrium radionuclide ventriculography

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(0/0)

Explicação

From an anterior or RAO planar image, the LV volume is determined planimetrically from first pass RNV. LVEF and RVEF can be determined by time-activity curves from regions of interest over the LV and RV respectively. Whereas RV voumes are very difficult o

330515

120

none

When the phase analysis image is displayed, pixels with the same color represent

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Explicação

the typical display of the phase image, codes pixels whose contractility occurs at the same time in the cardiac cycle, with like color

330517

120

none

Under nuclear techniques, a peak stress ejection fraction can be acquired by

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Explicação

SPECT MPI images are acquired POST stress. SPECT images are acquired over a 12-20 min period. Stress MUGA acquisitions are over 2-3 min, while those for first pass RNAs are 20-30 sec allowing for capture of peak stress images using these techniques

330518

120

none

The LV volume curve gives information about all the following except

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(0/0)

330523

120

none

When performing a first pass radionuclide angiogram to evaluate the LV, the radionuclide should be drawn up in a volume of

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(0/0)

Explicação

since images are acquired as a bolus of activity passes thru the heart and lungs, it is critical to administer the activity in a small volume. Most sources suggest less than 0.5 mL and the others, less than 1 mL

330527

120

none

Which of the following is a potential advantage of SPECT-ERNA over planar ERNA

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(0/0)

Explicação

in tomographic ERNA, there are more views IE SAX, VLA, and HLA, giving a better view of the septum. A better view of the septum yields better estimation of L and R ventricular separation

330529

120

none

When using an in vivo RBC tagging method, 99mTc sodium pertechnetate should be injected how long after stannous pyrophosphate

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(0/0)

330399

120

none

The LV endocardial border of a SPECT MPI may be sharpened using which acquisition/processing modification

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(0/0)

Explicação

spatial resolution is lower with 201-Tl than 99mTc, a LEAP vs LEHR collimator and an incr in detector to heart distance. Increasing the critical freq increases resolution (at the expense of increasing noise)

330400

120

none

55 yo F underwent tetrofosmin SPECT MPI for suspected CAD. The patient data is compared with male normal limits by mistake. A defect might be anticipated in which region

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(0/0)

Explicação

the normal male file anticipates that inferior count density is slightly lower than that of the anterior wall due to diaphragmatic attenuation. However, in a woman, due to breast attenuation, anterior count density is the same or less than that of the inf

330401

120

none

Regional wall motion in the distribution of an exercise stress induced perfusion abnormality on stress gated perfusion tomograms is most often

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(0/0)

Explicação

exercise-induced wall motion abn usually resolve quickly (<3 min). Post stress gated images are usually performed at 30 min and stress induced wall motion abn will have resolved. The rare exception is post-stress stunning. This is a specific marker of sev

330402

120

none

For SPECT imaging with mibi, compared to SPECT acquisition at 30 min following radiotracer inject at rest, delayed imaging at 90 min will demonstrate an interval decr in tracer conc in the

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(0/0)

Explicação

liver activity will gradually be excreted via the hepatobiliary tract over time. Mibi does not substantially wash out from the heart. Water or food will clear activity from the liver. Fat will cause the gallbladder to contract and excrete tracer into the

330403

120

none

Pt undergoing rest/stress mibi SPECT demonstrates right hemidiaphragmatic elevation and intense radiotracer conc in the liver in the planar projection images. SPECT images are using filtered back projection. The artifact most likely to be present in processed tomograms is

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Explicação

with intense tracer conc in the liver, the ramp filter (inherent to filtered back projection) will artifactually decr count density in the x-plane across the field of view

Nuclear 3

Questão 1 of 1

Tempo Restante

A single day mibi rest/stress SPECT MPI was performed using new reduced count density software. Resting activity administered was 6 mCi and a 12-min SPECT acquisition was performed. The most appropriate subsequent stress activity and acquisition time are

Selecione as respostas corretas

(0/0)

Explicação

For a two-day stress/rest mibi protocol, both the stress and rest SPECT acquisitions were gated. Both the stress and rest perfusion images were normal. The following functional parameters were determined: Rest EDV 95 cc, ESV 37 cc, EF 61%; Stress EDV 96 cc, ESV 45 cc, EF 53%

Selecione as respostas corretas

(0/0)

Explicação

In a gated perfusion SPECT scan considerable variation in the R-R intervals of the accepted cardiac cycles occurred. From reconstructed gated images which portion of the LV volume curve will be most likely affected

Selecione as respostas corretas

(0/0)

Explicação

Which of the following parameters are more easily quantified with gated blood pool SPECT but not with equilibrium radionuclide ventriculography

Selecione as respostas corretas

(0/0)

Explicação

When the phase analysis image is displayed, pixels with the same color represent

Selecione as respostas corretas

(0/0)

Explicação

Under nuclear techniques, a peak stress ejection fraction can be acquired by

Selecione as respostas corretas

(0/0)

Explicação

The LV volume curve gives information about all the following except

Selecione as respostas corretas

(0/0)

When performing a first pass radionuclide angiogram to evaluate the LV, the radionuclide should be drawn up in a volume of

Selecione as respostas corretas

(0/0)

Explicação

Which of the following is a potential advantage of SPECT-ERNA over planar ERNA

Selecione as respostas corretas

(0/0)

Explicação

When using an in vivo RBC tagging method, 99mTc sodium pertechnetate should be injected how long after stannous pyrophosphate

Selecione as respostas corretas

(0/0)

The LV endocardial border of a SPECT MPI may be sharpened using which acquisition/processing modification

Selecione as respostas corretas

(0/0)

Explicação

55 yo F underwent tetrofosmin SPECT MPI for suspected CAD. The patient data is compared with male normal limits by mistake. A defect might be anticipated in which region

Selecione as respostas corretas

(0/0)

Explicação

Regional wall motion in the distribution of an exercise stress induced perfusion abnormality on stress gated perfusion tomograms is most often

Selecione as respostas corretas

(0/0)

Explicação

For SPECT imaging with mibi, compared to SPECT acquisition at 30 min following radiotracer inject at rest, delayed imaging at 90 min will demonstrate an interval decr in tracer conc in the

Selecione as respostas corretas

(0/0)

Explicação

Pt undergoing rest/stress mibi SPECT demonstrates right hemidiaphragmatic elevation and intense radiotracer conc in the liver in the planar projection images. SPECT images are using filtered back projection. The artifact most likely to be present in processed tomograms is

Selecione as respostas corretas

(0/0)

Explicação

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