Article Figures & Data
Figures
- FIGURE 1.
Illustration of proposed 7-segment slant-hole collimator. Projection is elongated at outer sections. Dashed ellipses represent projection on that section of detector when sphere is placed at rotation center.
- FIGURE 2.
Cross section of common volume (CV) in x,y-plane.
- FIGURE 3.
Definition of slant angles η and φ, detector coordinates, and object coordinates. z-axis is rotation axis of detector.
- FIGURE 4.
Setup of point source P.
- FIGURE 5.
Illustration of geometric response for parallel holes and slant holes.
- FIGURE 6.
Close-up diagram of footprint of point response function with respect to slant angles α and β.
- FIGURE 7.
Reconstruction results of point source without (left) and with (right) blurring correction. Five and 50 iterations were used, respectively.
- FIGURE 8.
Reconstruction results of 2 point sources at 50 iterations. Left one was reconstructed with true parameters. Right one was reconstructed with estimated parameters. Blurring correction was applied in both images.
- FIGURE 9.
rojection of point source at 90°.
- FIGURE 10.
Reconstruction results of point source. From left to right: without calibration, with joint estimation calibration but no blurring correction, with joint estimation calibration and blurring correction. Sixty iterations were applied.
- FIGURE 11.
Projection of heart phantom at 0° and 90°.
- FIGURE 12.
Reconstruction results of heart phantom without calibration (top), with calibration but no blurring correction(middle), and with calibration and blurring correction (bottom). From left to right: vertical long-axis, short-axis, and horizontal long-axis cuts. All images were reconstructed at 80 iterations.
- FIGURE 13.
Slices showing defect before (top) and after (bottom) calibration. VLA cut is on left, SA cut on right. Blurring correction was applied. All images were scaled to [0 255] and were displayed using the same scale. Image contrast was enhanced for better visualization of defect. A color version of this figure is available as a supplemental file at http://tech.snmjournals.org.
Tables
Parameter Data Isotope 99mTc Activity 3 MBq Energy window 15% Hole shape Hexagon Hole diameter 1.9 mm Septal thickness 0.3 mm Rotation radius f 266.5 mm ηII −25.7° ηIII 12.9° ηIV 35.0° ηV −35.0° ηVI −12.9° ηVII 25.7° φII 22.0° φIII 24.5° φIV 6.1° φV −6.1° φVI −24.5° φVII −22.0° Section no. Slant angle β (deg) Septum length (mm) II and VII 25 16.6 III and VI 22.35 16.22 IV and V 28 17 I 0 15 Section no. Estimated η (deg) η-error (%) Estimated f (mm) Estimated φ (deg) φ-error (%) Estimated f (mm) II −27.2 5.8 250.9 21.9 0.5 266.5 III 13.7 6.2 253.1 24.8 1.2 261.8 IV 35.9 2.6 259.8 7.1 16.4 226.2 V −35.8 2.3 260.3 −6.3 3.3 256.3 VI −13.6 5.4 251.7 −24.8 1.2 261.9 VII 25.7 0.0 267.0 −22.0 0.0 265.1 f (mm) 256.7 ± 11.1 Section no. Estimated η (deg) η-error (%) Estimated φ (deg) φ-error (%) Estimated f (mm) f-error (%) II −25.8 0.4 22.1 0.5 265.5 0.4 III 12.9 0.0 24.6 0.4 265.5 0.4 IV 35.1 0.3 6.1 0.0 265.5 0.4 V −35.1 0.3 −6.1 0.0 265.5 0.4 VI −12.9 0.0 −24.6 0.4 265.5 0.4 VII 25.8 0.4 −22.1 0.5 265.5 0.4 Section no. Independent estimated η (deg) Independent estimated f (mm) Independent estimated φ (deg) Independent estimated f (mm) Joint estimated η (deg) Joint estimated φ (deg) Joint estimated f (mm) II −24.6 285.5 29.3 239.2 −28.1 ± 0.2 28.1 ± 0.2 249.2 ± 2 III 17.6 233.1 29.2 242.3 16.1 ± 0.1 27.7 ± 0.2 249.2 ± 2 IV 42.2 240.4 5.2 245.7 39.6 ± 0.2 4.4 ± 0.1 249.2 ± 2 V −38.7 253.9 −3.7 255.0 −39.6 ± 0.2 −4.4 ± 0.1 249.2 ± 2 VI −14.8 257.1 −28.2 224.7 −16.1 ± 0.1 −27.7 ± 0.2 249.2 ± 2 VII 29.8 239.7 −29.1 228.1 28.1 ± 0.2 −28.1 ± 0.2 249.2 ± 2
Supplemental Data
Files in this Data Supplement:
Jump to section
Related Articles
Cited By...
- No citing articles found.