Clinical evaluation of hepatic scintigraphy

Area of Science:

• Diagnostic imaging
• Nuclear medicine

Background:

• Liver scintigraphy is a diagnostic tool for focal liver diseases.
• Technological advancements have aimed to improve its accuracy.
• Assessing the diagnostic performance of liver scintigraphy is crucial for clinical decision-making.

Purpose of the Study:

• To evaluate the diagnostic accuracy of liver scintigraphy in identifying focal liver diseases.
• To compare the diagnostic values obtained using a rectilinear scanner versus a gamma camera.
• To determine the clinical utility of liver scintigraphy in suspected or proven cancer cases.

Main Methods:

• Two patient groups were examined using different imaging devices: rectilinear scanner and gamma camera.
• Predictive diagnostic values (PV pos. and PV neg.) were calculated for each group.
• Literature review was conducted to assess historical accuracy trends.

Main Results:

• With a rectilinear scanner, positive predictive value (PV pos.) was 71% and negative predictive value (PV neg.) was 84%.
• With a gamma camera, PV pos. was 56% and PV neg. was 97%.
• A motion correction device did not enhance interpretation accuracy; literature suggests no improvement over 6-7 years.

Conclusions:

• Liver scintigraphy demonstrates variable diagnostic accuracy for focal liver diseases.
• Gamma camera imaging showed a higher negative predictive value but lower positive predictive value compared to the rectilinear scanner.
• Despite limitations, liver scintigraphy remains indicated for patients with suspected or confirmed cancer.