A Study on the Determination of Scan Speed in Whole Body Bone Scan Applying Oncoflash Gwang Gil Yang Department of Nuclear Medicine, Asan Medical Center,

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Presentation transcript:

A Study on the Determination of Scan Speed in Whole Body Bone Scan Applying Oncoflash Gwang Gil Yang Department of Nuclear Medicine, Asan Medical Center, Seoul, Korea

Introduction Whole Body Bone Scan Radiopharmaceutical Injection Wholebody Scan (required about 15mins) 3~4 hrs delay

Purpose Save of scan time Maintenance of Image quality Oncoflash Application Proper Criteria

Materials and Method Quantitative evaluation Classified by the total counts - under 800K, over 800K, 900K, 1,000K, 1,500K, and 2,000K. Duration / Subject - July, 2008 / 329 patients Correlation evaluation Correlation analysis - Total counts (30cm/min) and PPM counts Duration / Subject – August, 2008 / 152 patients FWHM evaluation FWHM comparison with 4-Quadrant bar phantom - before and after applying the Oncoflash

Materials and Method Equipment / Collimator SIEMENS Symbia T2, E.CAM Signature LEHR Collimator Analysis program Syngo MI Application : Series FWHM Proc SPSS 12.0 Matrix size : 256 x 1024 / Window center : 140kev Window width : ±15% Acquisition Parameter

Materials and Method Definition of PPM Counts (Kilo Counts/sec, kcts/s)

Materials and Method FWHM measurement

Results Scan Speed : 30 cm/min Scan Speed : 15 cm/min Not applied Applied Not applied Applied Quantitative evaluation Total Counts - under 1,000K – : coarse particles and increased noises. (* Same Patient)

Results Total Counts (K)Geometric Mean ± SD (K)PersonRatio ~ ± % 17.6 % 800 ~ ± % 900 ~ ± % 1000 ~ ± % 82.4 % 1500 ~ ± % 2000 ~2294 ± % Total % Quantitative evaluation Total Counts - under 1,000K – : coarse particles and increased noises. The Percentage according to Total Counts

Results FWHM Value after applying the Oncoflash : PPM counts of under 3.6K, were higher. : Whereas over 3.6K, were lower. FWHM evaluation (kcts/s) FWHM Comparison of FWHM Value between Applied and Not-applied Oncoflash

Results PPM counts (KiloCounts/sec) Total Counts ± SD (K)PersonRatio 2.5 ~ 3.0K965±173K % 3.1 ~ 3.5K1084±154K % 3.6 ~ 4.0K1242±186K % 4.1 ~ 4.5K1359±170K % 4.6 ~ 5.0K1405±184K % 5.1 ~ 6.0K1640±376K % 6.1 ~ 7.0K1771±324K 41.3% 7.1K ~1972±385K 32.0% Total % Correlations between PPM counts and Total counts : strong correlation (r=.775, p<.01). Correlation evaluation Correlation between PPM Counts and Total Counts

Results (kcts/s) Correlations between PPM counts and Total counts : strong correlation (r=.775, p<.01). Correlation evaluation Total Counts Correlation between PPM Counts and Total Counts

Results PPM countWholebody count PPM count Pearson correlation coefficient 1.775** significance probability.000 Total sum of square, cross product 147/ covariance N152 Wholebody count Pearson correlation coefficient.775**1 significance probability.000 Total sum of square, cross product covariance N152 Correlations between PPM counts and Total counts : strong correlation (r=.775, p<.01). Correlation evaluation Pearson Correlation Coefficient between PPM Counts and Total Counts

Conclusion PPM counts - over 3.6K - & Total counts - over 1,000K - - The image applying the Oncoflash was similar in quality to raw image (not applying Oncoflash). - Reduce scan time without any damage on the image quality. Total counts - under 1,000K – - Oncoflash is applied, Image quality were decreased. - Recommended to perform the re-image in the scan speed of 15cm/min.

Thank You