Functional Liver Volume Determination

Functional liver volume measurement: Liver volume is an important clinical indicator of liver reserve function. The single-photon emission tomography (SPECT) liver colloid imaging method was used to accurately measure the functional volume of the liver, and its clinical significance was further explored. The examination method was fasted for more than 4 hours before the injection, sodium phytate was injected intravenously, and a tomographic scan was started 20 minutes later. Using SPECT instrument, the probe is a low-energy high-resolution VXGO parallel long hole collimator. The scanning parameters are set to matrix 128*128, one frame is collected every 25s, and 64 frames are collected around the human body. Each slice is separated by pixels. . Basic Information Specialist classification: Digestive examination classification: other examinations Applicable gender: whether men and women apply fasting: not fasting Tips: Fasting for more than 4 hours before the test. Normal value The normal human liver volume is 1371 193 mL. Clinical significance Abnormal result Liver cirrhosis, liver volume of liver cancer patients are smaller than normal controls. Need to check the crowd: patients with liver damage. Low results may be diseases: liver cirrhosis, liver cancer considerations Taboo before inspection: 1. Fasting for more than 4 hours before the examination. 2. The parameters of the instrument must be set before inspection. It is contraindicated during the examination: the tomographic scan can only be performed after intravenous injection of sodium phytate for 20 minutes. Inspection process The examination method was fasted for more than 4 hours before the injection, sodium phytate was injected intravenously, and a tomographic scan was started 20 minutes later. Using SPECT instrument, the probe is a low-energy high-resolution VXGO parallel long hole collimator. The scanning parameters are set to matrix 128*128, one frame is collected every 25s, and 64 frames are collected around the human body. Each slice is separated by pixels. . Calculation of liver volume: After image reconstruction, the liver volume was calculated using classical boundary-graphing and representative pixel methods, respectively. The boundary tracing method is to draw the region of interest on the liver boundary determined by the 阂 value on each of the tomographic ROI images, and add the number of pixels included in each slice. Volume = total number of pixels * side length of the unit pixel . The representative pixel method is to determine the total liver radioactivity count and a representative pixel radioactivity count, volume = total liver radioactivity count / representative pixel radioactivity count * unit pixel side length. Each study was tracing twice at different times and the mean was taken as the final result. Not suitable for the crowd Not suitable for people: no Adverse reactions and risks Nothing.

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