Research on the method of controlling the 99mTc-Technegas inhaled during 1-day pulmonary ventilation/perfusion imaging

Objective Our purpose was to establish a simple and feasible method for monitoring and controlling the 99mTc-Technegas inhaled to improve the success ratio of imaging and ensure the imaging quality. Materials and methods The relationship between the success ratio and the pulmonary ventilation counting rate (VCR) of 113 cases, the activity of perfusion imaging agents injected and the pulmonary perfusion counting rate (PCR) of another 114 cases were analysed retrospectively. And combined with the relationship between the surface radioactivity monitoring value and the SPECT probe counting rate of a pulmonary model, the effective range of the VCR and the surface radioactivity monitoring value were determined. Two hundred fifty cases with 99mTc-Technegas inhaled monitored and controlled were used to verify the reliability and practicability of this method. Results The VCR of the ventilation/perfusion imaging with deep venous thrombosis imaging and the ventilation/perfusion imaging without deep venous thrombosis imaging was in 1.0–3.0 kct/s and 1.0–2.0 kct/s when the monitoring values of handheld radiation monitor was within the range of 60–170 µSv/h and 60–110 µSv/h, respectively. The success ratio of the V/Q-Only increased from 48.9% (43/88) of the control group to 80.8% (122/151) of the experimental group. The VCR in the two groups was examined by the non-parametric Mann–Whitney U test (P
Source: Nuclear Medicine Communications - Category: Nuclear Medicine Tags: Original Articles Source Type: research