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Color doppler energy: A more sensitive look at renal perfusion
Vol. 2, No. 12, December 1995
P-41 Age-Related Changes in Body Composition as Measured by Dual Energy X-Ray Absorptiometry (DEXA) Sriram Padmanabhan, Paul Clopton, Avraham Moscona, David J. Sartoris. University of California at San Diego Medical Center.
PURPOSE : The objectives of this study were to use body composition data obtained by dual e n e r g y x - r a y absorptiometry ( D E X A ) ( 1 ) - t o establish n o r m a t i v e data for lean tissue, fat, B M C ( B o n e m i n e r a l C o n t e n t ) a n d B M D ( B o n e Mineral Density) for w o m e n aged 50-80 yrs to provide baseline i n f o r m a t i o n for s t u d y i n g body c o m p o s i t i o n c h a n g e s w i t h age a n d ~lisease, (2) to study correlations b e t w e e n these four parameters. MATERIALS AND METHODS : Total body D E X A scans performed o~t 47 w o m e n aged 50-80 yrs u s i n g a L u n a r D P X D E X A scanner--were used to derive total and regional values o f lean mass, rat, B M C and B M D . Statistical m e t h o d s used include regression analysis, correlation, m e a s u r e m e n t o f variance a n d A N O V A . R E S U L T S : _(1) There are n o r m a l age-related losses in lean mass, B M C a n d B M D i n w o m e n aged 50-80 yrs. There is n o obsex:vable correlation between age and fat tissue. (2) There is strong positive correlation between total body fat and fat in the arms (p= 0.000), legs(p=0.000) and trtmk(p=0.000). The ~trongest correlation was w i t h the t r u n k ( R = 0 . 9 9 ) . (3) There is a strong positive correlation of Lean mass to B M C in all regions(p = 0.000 to 0.004). F a t to B M C c o r r e l a t i o n w a s n o t so strong, particularly in the n o n w e i g h t - b u n t i n g regions e.g. arms(p = 0.000 to 0 . g l l ) . Lean to B M D shows strong positive correlation in m o s t regions(p=.001 to .065) a n d fat to B M D shows strong correlation in all regions(p=.000 to .012) C O N C L U S I O N S : D E X A is an effective method to evaluate body lean, fat a n d c a l c i u m c o m p o s i t i o n and changes thereof. O u r study involving total and regional f a t suggests t h a t clinical m e a s n r e m a n t o f a r m skinfold thickness is a r e a s o n a b l e estimate o f total body fat.
P-43 Color Doppler Energy: A More SensRive Look at Renal Perfusion Peggy Reep, M.D., Teresita Angtuaco, M.D. University of Arkansas for Medical Science.
Purpose:
To compare conventional color doppler imaging (CDI) to color doppler energy (CDE) in the evaluation of renal perfusion in patients with azotemia.
Method:
Patients referred to the ultrasound laboratory for renal studies were examined using conventional color doppler imaging and color doppler energy for a period of three months. Images were compared as to number of vessels detected and ease of recording of spectral data. Advantages and disadvantages of CDE were determined based on the input of three experienced sonographers.
Results:
Significant improvement in conspicuity of renal vessels could be appreciated in more than 90% of patients. Recording of spectral data was improved in approximately the same number. There is less motion artifacts noted on CDE studies. However, the direction of flow cannot be determined on color images alone. This disadvantage is outweighed by the improved detection of renal vaseularity for spectral interrogation.
Conclusions:
Color Dopper Energy is superior to conventional color doppler in evaluating renal vasculatity in patients with azotemia. Its use results in more rapid renal evaluation and improved patient throughput.
POSTERS
P-42 MR Tissue Characterization using a Multiparameter Composite Segmentation Technique W. Eugene Phillips, II, M.D., W.M. Mundy, Ed.D., E.F. Binet, M.D., H.K. Brown, Ph.D. Medical College of Georgia, North Georgia College.
PURPOSE: To demonstrate the application of a PC-based multipmmmeter full color composite display technique of MR images of several selected patients with various pathologies while Lsae.salng the ability of this technique to quantitatively and qualitatively segment clinically important anatomic and pathofugie assues. METHODS: Using a PC with a 386 microprocessor and full color 24-bit graphics display capabilities, custom and commercially available image-processing sol,rares wer~ applied to spatially aligned multiparameter T1 and T2 weighted, proton density and fat suppression MR image sets prospectively obtained from patients with known pathology to generate intensity-based color composites. Quantitative color channel analysis was used to assess the abifity of this technique to differenaally segment auatemically and pathologicatiy confirmed tissue types into unique color regions within the full color spectrum in each patient e.4~eusing 95 % confidence intervals. RESULTS: Based on the results of pathologic and/or MR correlation and color imaging analysis, the appfiention of fur color composite generation techniques to multiple MR images of selected radiology cases represents a viable t~hnlque for displaying diagnostically relevant tissue contrast information in one color image. CONCLUSIONS: With this teeknique, it is possible to generate composites that simultaneously display uniquely color-exuded anatemie and pathologic tissue information within the context of partially nateral-sppearlng MR images.
P-44 WITHDRAWN
1165
P-41 Age-Related Changes in Body Composition as Measured by Dual Energy X-Ray Absorptiometry (DEXA) Sriram Padmanabhan, Paul Clopton, Avraham Moscona, David J. Sartoris. University of California at San Diego Medical Center.
PURPOSE : The objectives of this study were to use body composition data obtained by dual e n e r g y x - r a y absorptiometry ( D E X A ) ( 1 ) - t o establish n o r m a t i v e data for lean tissue, fat, B M C ( B o n e m i n e r a l C o n t e n t ) a n d B M D ( B o n e Mineral Density) for w o m e n aged 50-80 yrs to provide baseline i n f o r m a t i o n for s t u d y i n g body c o m p o s i t i o n c h a n g e s w i t h age a n d ~lisease, (2) to study correlations b e t w e e n these four parameters. MATERIALS AND METHODS : Total body D E X A scans performed o~t 47 w o m e n aged 50-80 yrs u s i n g a L u n a r D P X D E X A scanner--were used to derive total and regional values o f lean mass, rat, B M C and B M D . Statistical m e t h o d s used include regression analysis, correlation, m e a s u r e m e n t o f variance a n d A N O V A . R E S U L T S : _(1) There are n o r m a l age-related losses in lean mass, B M C a n d B M D i n w o m e n aged 50-80 yrs. There is n o obsex:vable correlation between age and fat tissue. (2) There is strong positive correlation between total body fat and fat in the arms (p= 0.000), legs(p=0.000) and trtmk(p=0.000). The ~trongest correlation was w i t h the t r u n k ( R = 0 . 9 9 ) . (3) There is a strong positive correlation of Lean mass to B M C in all regions(p = 0.000 to 0.004). F a t to B M C c o r r e l a t i o n w a s n o t so strong, particularly in the n o n w e i g h t - b u n t i n g regions e.g. arms(p = 0.000 to 0 . g l l ) . Lean to B M D shows strong positive correlation in m o s t regions(p=.001 to .065) a n d fat to B M D shows strong correlation in all regions(p=.000 to .012) C O N C L U S I O N S : D E X A is an effective method to evaluate body lean, fat a n d c a l c i u m c o m p o s i t i o n and changes thereof. O u r study involving total and regional f a t suggests t h a t clinical m e a s n r e m a n t o f a r m skinfold thickness is a r e a s o n a b l e estimate o f total body fat.
P-43 Color Doppler Energy: A More SensRive Look at Renal Perfusion Peggy Reep, M.D., Teresita Angtuaco, M.D. University of Arkansas for Medical Science.
Purpose:
To compare conventional color doppler imaging (CDI) to color doppler energy (CDE) in the evaluation of renal perfusion in patients with azotemia.
Method:
Patients referred to the ultrasound laboratory for renal studies were examined using conventional color doppler imaging and color doppler energy for a period of three months. Images were compared as to number of vessels detected and ease of recording of spectral data. Advantages and disadvantages of CDE were determined based on the input of three experienced sonographers.
Results:
Significant improvement in conspicuity of renal vessels could be appreciated in more than 90% of patients. Recording of spectral data was improved in approximately the same number. There is less motion artifacts noted on CDE studies. However, the direction of flow cannot be determined on color images alone. This disadvantage is outweighed by the improved detection of renal vaseularity for spectral interrogation.
Conclusions:
Color Dopper Energy is superior to conventional color doppler in evaluating renal vasculatity in patients with azotemia. Its use results in more rapid renal evaluation and improved patient throughput.
POSTERS
P-42 MR Tissue Characterization using a Multiparameter Composite Segmentation Technique W. Eugene Phillips, II, M.D., W.M. Mundy, Ed.D., E.F. Binet, M.D., H.K. Brown, Ph.D. Medical College of Georgia, North Georgia College.
PURPOSE: To demonstrate the application of a PC-based multipmmmeter full color composite display technique of MR images of several selected patients with various pathologies while Lsae.salng the ability of this technique to quantitatively and qualitatively segment clinically important anatomic and pathofugie assues. METHODS: Using a PC with a 386 microprocessor and full color 24-bit graphics display capabilities, custom and commercially available image-processing sol,rares wer~ applied to spatially aligned multiparameter T1 and T2 weighted, proton density and fat suppression MR image sets prospectively obtained from patients with known pathology to generate intensity-based color composites. Quantitative color channel analysis was used to assess the abifity of this technique to differenaally segment auatemically and pathologicatiy confirmed tissue types into unique color regions within the full color spectrum in each patient e.4~eusing 95 % confidence intervals. RESULTS: Based on the results of pathologic and/or MR correlation and color imaging analysis, the appfiention of fur color composite generation techniques to multiple MR images of selected radiology cases represents a viable t~hnlque for displaying diagnostically relevant tissue contrast information in one color image. CONCLUSIONS: With this teeknique, it is possible to generate composites that simultaneously display uniquely color-exuded anatemie and pathologic tissue information within the context of partially nateral-sppearlng MR images.
P-44 WITHDRAWN
1165