Examination of Some Factors Affected Right-to-left Shunt Rate and the Normal Value of Right-to-left Shunt Rate in Lung Perfusion Scintigraphy
| Autor: | Fumitoshi Nakamura, Taketoshi Okawada, Takaaki Ono, Naoko Muromoto, Masafumi Okabe, Yousuke Sugimura, Ryou Suzuki |
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| Rok vydání: | 2017 |
| Předmět: |
Male
medicine.medical_specialty Perfusion Imaging Right-to-left shunt 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Lung perfusion scintigraphy Region of interest medicine.artery Image Interpretation Computer-Assisted medicine Humans Lung Normal range Aged business.industry Normal level General Medicine medicine.disease Pulmonary embolism Shunt (medical) Visual field 030220 oncology & carcinogenesis Female Radiology business |
| Zdroj: | Japanese Journal of Radiological Technology. 73:120-127 |
| ISSN: | 1881-4883 0369-4305 |
| Popis: | PURPOSE Diagnosis for right-to-left shunt was determined by the assessment of shunt-rate, which was obtained by using 99 mTc-macroaggregated albumin. However, it is difficult to diagnose right-to-left shunt, using the normal level of shunt-rate measured by using conventional methods. To solve this problem, we investigated ourselves the normal level of shunt-rate. METHOD We researched 20 patients with pulmonary embolism, and they didn't have right-to-left shunt. We investigated three points for the normal level of shunt-rate. First, we examined the region of interest (ROI) area of the lungs to modify the upper level of gray scale. Second, we confirmed the difference between the whole visual field and body contour of the ROI area. Third, we examined the necessity whether we correct the background of whole body and the lungs. RESULT We resulted three points. First, stable right-to-left shunt rate is got to set that the upper level of gray scale is 35%. Second, there is no significant difference between the whole visual field and body contour of the ROI area. Third, correcting background isn't needed to get right-to-left shunt rate. The normal level of the shunt-rate was 12.6±2.8% in the condition. CONCLUSION We are able to decide the optimal condition for the normal level of shunt-rate. It is important to evaluate the normal level of the shunt-rate fixed on each factor in each hospital. |
| Databáze: | OpenAIRE |
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