X-ray Computed Tomography chapter 9 and Hybrid Imaging Systems: PET-CT and SPECT-CT chapter 10

True or False: X-ray production is an efficient process. The majority of electrons striking the tungsten target cause the emission of x-rays

false

Part 1: Which of the following statements are true about the x-ray beam produced by x-ray tubes

the beam is a combination of characteristics and bremsstrahlung radiation

Part 2: Which of the following statements are true about the x-ray beam produced by x-ray tubes

Which of the following statements are true about the x-ray beam produced by x-ray tubes

Part 1: which of the following statements are true concerning CT scanning

CT images acquired in conjunction with PET images can provide useful correlative anatomic information

Part 2: which of the following statements are true concerning CT scanning

Helical CT scanning allows faster acquisition times and greater flexibility in image reconstruction compared with conventional axial CT scannning

Part 3: which of the following statements are true concerning CT scanning

current CT scanners consist of a stationary ring of detectors with an inner rotating x-ray source or a rotating arc of detectors that oppose the rotating x-ray source

True or False: a common definition of the term pitch when used in reference to helical CT scanning is the ratio of the distance the patient bed advances per gantry revolution to the width of the collimated x-ray beam

true

Select the numbers of Hounsfield units (HU) from the values below that most closely correspond to the following

bone

1000

Select the numbers of Hounsfield units (HU) from the values below that most closely correspond to the following

Fat

-10

Select the numbers of Hounsfield units (HU) from the values below that most closely correspond to the following

Muscle

30

Select the numbers of Hounsfield units (HU) from the values below that most closely correspond to the following

Air

-1000

Select the numbers of Hounsfield units (HU) from the values below that most closely correspond to the following

Water

0

Part 1: what are the advantages of helical scanning

faster scan times

Part 2: what are the advantages of helical scanning

greater flexibility in angle of reconstruction of axial slices

Part 3: what are the advantages of helical scanning

higher quality coronal and sagittal reconstruction views

Part 1: artifacts in hybrid imaging can occur as the result of which of the following

breath holding following deep inspiration during CT acquisition followed by normal breathing during PET or SPECT acquisition

Part 2: artifacts in hybrid imaging can occur as the result of which of the following

attenuation correction of PET or SPECT images with contrast CT images

Part 1: what are some of the advantages of using a hybrid imaging system

misregistration as a result of patient motion is reduced as the patient remains on the same imaging pallet (bed) during acquisition of both the CT and the PET or SPECT images

Part 2: what are some of the advantages of using a hybrid imaging system

the CT images can be used both for attenuation correction of the PET or SPECT images and for localization of the PET or SPECT image findings