Eliminate the parameter to find a Cartesian equation of the curve. 
Definitions:
PET
A Positron Emission Tomography scan, a type of imaging test that helps reveal how your tissues and organs are functioning.
fMRI
Functional magnetic resonance imaging, a neuroimaging procedure using MRI technology that measures brain activity by detecting changes associated with blood flow.
MMPI-II
Minnesota Multiphasic Personality Inventory-2, a psychological test that assesses personality traits and psychopathology to assist in diagnosing mental disorders.
Exner System
A systematic approach to interpreting the Rorschach inkblot test, developed by John Exner, used in psychological evaluation and diagnosis.
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