what is a single photon emission CT? (SPECT)
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a scintigraphic technique where the computer is programmed to analyse
data coming from a single depth within the patient
SPECT allows greater sensitivity in the detection of subtle lesions overlain
by other active structures
T1 images
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, the timing of radiofrequency pulse sequences used to make T1 images
results in images which highlight fat tissue within the body
1 tissue type is bright - FAT
what is ALARA?
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as low as reasonably achievable
means making every effort to maintain exposures to ionising radiation as far
below the dose limits as practical
what do tissues of low density / atomic number do for x-rays/radiographs?
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cause less attenuation of the X-ray beam and appear darker on radiographs
than tissues of higher density
what are the disadvantages of ultrasound?
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highly operator dependent
structures surrounded by bone such as brain/spinal cord do not give
clinically useful images
, the attenuation of the ultrasound signal at air/tissue boundaries means that
the technique is not suitable for imaging structures in the lung or
abdominal organs obscured by gas in the overlying bowel
what is magnetic resonance imaging? (MRI)
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mri systems use a powerful magnetic field and radiofrequency pulses to
produce detailed images of the body's internal structures
as cross sectional images/slices
provides high quality images with excellent contrast detail of soft tissue and
anatomic structures such as gray and white matter in the brain
what are the advantages of scintigraphy (nuclear medicine)?
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good functional information
good localisation of pathology
what is tomography?
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Give this one a try later!
a scintigraphic technique where the computer is programmed to analyse
data coming from a single depth within the patient
SPECT allows greater sensitivity in the detection of subtle lesions overlain
by other active structures
T1 images
Give this one a try later!
, the timing of radiofrequency pulse sequences used to make T1 images
results in images which highlight fat tissue within the body
1 tissue type is bright - FAT
what is ALARA?
Give this one a try later!
as low as reasonably achievable
means making every effort to maintain exposures to ionising radiation as far
below the dose limits as practical
what do tissues of low density / atomic number do for x-rays/radiographs?
Give this one a try later!
cause less attenuation of the X-ray beam and appear darker on radiographs
than tissues of higher density
what are the disadvantages of ultrasound?
Give this one a try later!
highly operator dependent
structures surrounded by bone such as brain/spinal cord do not give
clinically useful images
, the attenuation of the ultrasound signal at air/tissue boundaries means that
the technique is not suitable for imaging structures in the lung or
abdominal organs obscured by gas in the overlying bowel
what is magnetic resonance imaging? (MRI)
Give this one a try later!
mri systems use a powerful magnetic field and radiofrequency pulses to
produce detailed images of the body's internal structures
as cross sectional images/slices
provides high quality images with excellent contrast detail of soft tissue and
anatomic structures such as gray and white matter in the brain
what are the advantages of scintigraphy (nuclear medicine)?
Give this one a try later!
good functional information
good localisation of pathology
what is tomography?
Give this one a try later!
