Thyroid radio Flashcards
Technetium-99m has an uptake mechanism similar to _______
Iodine
What type of image do we get in scintigraphy ?
2D
What are the techniques used in thyroid ?
US
Scintigraphy
CT/MRI - useful only in some px
what do we assess with US on thyroid ?
Evaluation of the :
** number of lesions
** Sites
** Calcifications
vascular evaluation of thyroid can be done with ?
color doppler
What radioisotope is indicated for diagnosis of Grave’s disease ?
Tc 99m-Pertechnetate
plummers diseases appears as
solitary hot nodule
what is the distribution seen with Tc 99m pertechnetate with graves disease ?
Homogenous distribution
what is the distribution seen with Tc 99m pertechnetate with multinodular goiter disease ?
Inhomogeneous distribution
what is the distribution seen with Tc 99m pertechnetate with subacute thyroiditis ?
Markedly reduced uptake
what tracer is used for scintigraphy ?
Iodine 131- gamma emitter, has diagnostic use
I-131 is selectively taken up by what cells ?
Thyroid follicular cells with the help of sodium-iodine symporters
what type of emitter is Iodine-131 ?
both Beta and Gamma
what is the main thing we check for with scintigraphy of the thyroid ?
How the nodules appear.
What is the first line indication test for most patients with UNCERTAIN etiology of Thyrotoxicosis ?
Thyroid Scintigraphy