Article Figures & Data
Tables
SPECT system Software package Number of detectors Crystal dimensions (mm) Number of photomultiplier tubes Collimator System 1 Xeleris 1 520 × 370 46 LEHR System 2 Xeleris 2 540 × 400 59 LEHR System 3 eSoft 2 533 × 387 49 LEHR System 4 INTXP 2 530 × 390 59 LEHR System 5 Pegasys 2 508 × 381 48 LEGP LEHR = low-energy high-resolution; LEGP = low-energy general-purpose.
System 1 System 2 System 3 System 4 System 5 Parameter General Brain General Brain General Brain General Brain General Brain Number of projections 128 64 120 120 128 64 128 64 128 64 Matrix 128 × 128 64 × 64 64 × 64 128 × 128 128 × 128 64 × 64 128 × 128 128 × 128 128 × 128 64 × 64 Rotation CO/NCO CO/NCO CO CO CO/NCO CO/NCO CO/NCO CO/NCO CO CO Counts per projection (kilocounts) 65 65 65 65 60 60 65 65 65 65 Zoom 1 1–1.46 1 1–1.28 1–1.23 1–1.45 1 1 1 1–1.46 Projection matrix 128 × 128 64 × 64 64 × 64 128 × 128 128 × 128 64 × 64 128 × 128 128 × 128 128 × 128 64 × 64 Filter Butterworth Hanning Butterworth Hanning Butterworth Butterworth Butterworth Butterworth Hanning Hanning Cutoff frequency (cycle/mm) 0.064 0.055 0.064 0.055 0.031 0.031 0.085 0.085 0.070 0.070 Order 10 10 10 10 10 10 Attenuation coefficient (cm−1) 0.12 0.12 0.12 0.12 0.15 0.15 0.16 0.16 0.12 0.12 Planar FWHM (mm) 15.12 15.12 13.41 13.41 13.74 13.74 13.11 13.11 23.53 23.53 Tomographic FWHM (mm) 15.25 15.25 13.68 13.68 14.21 14.21 13.47 13.47 26.11* 26.11* *At 34-cm radius of rotation.
CO = circular orbit; NCO = noncircular orbit.
System 1 System 2 System 3 System 4 System 5 Protocol Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Brain (CO) 51.65 (z = 1.46) 10.48 (z = 1.46) 67.41 (z = 1.28) 19.87 (z = 1.28) 48.28 (z = 1.45) 9.28 (z = 1.45) 52.63 16.22 32.17 (z = 1.46) 8.36 (z = 1.45) Brain (NCO) 49.19 5.32 — — 26.63 5.16 60 15.81 — — Brain (NCO) (zoom) 53.26 (z = 1.46) 11.02 (z = 1.46) — — 41.89 (z = 1.45) 10.21 (z = 1.45) — — — — General SPECT (CO) 46.67 10.54 32.48 4.36 56.76 11.55 57.14 14.29 39.13 9.33 General SPECT (NCO) 54.35 10.43 — — 67.47 10.98 67.39 14.74 — — CO = circular orbit; NCO = noncircular orbit.
System 1 System 2 System 3 System 4 System 5 Protocol Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Brain (CO) (zoom) 69.97 (z = 1.46) 4.13 (z = 1.46) 73.31 (z = 1.28) 10.99 (z = 1.28) 52.99 (z = 1.45) 2.92 (z = 1.45) 62.07 10.72 42.09 (z = 1.46) 4.72 (z = 1.45) Brain (NCO) 61.79 2.39 — — 44.35 2.16 67.71 10.21 — — Brain (NCO) (zoom) 56.94 (z = 1.46) 4.81 (z = 1.46) — — 59.77 (z = 1.45) 3.59 (z = 1.45) — — — — General SPECT (CO) 56.94 4.81 47.85 1.97 70.52 2.93 70.62 6.88 47.84 5.2 General SPECT(NCO) 62.5 4.86 — — 79.73 3.02 73.02 7.27 — — CO = circular orbit; NCO = noncircular orbit.
Systems 1 and 2 software System 3 software System 4 software System 5 software SPECT system Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) System 1 53.93 3.4 64.73 3.31 54.92 3.5 52 3.2 System 2 67.24 3.01 72.95 3.04 61.25 3.21 60.17 2.92 System 3 69.26 3.02 83.9 2.94 65.41 3.09 95.2 3.86 System 4 58.2 4.01 62.96 3.85 58.62 4.15 65.33 3.85 System 5 34.27 3.35 41.64 3.24 34.25 3.2 34.85 3.02 Systems 1 and 2 software System 3 software System 4 software System 5 software SPECT system Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) Contrast (%) RMS (%) System 1 62.42 1.7 68.99 1.72 62.06 1.84 55.4 1.74 System 2 71.82 1.57 69.62 1.88 68.47 1.79 65.62 1.6 System 3 73.99 1.57 83.02 1.55 71.2 1.73 96.25 2.13 System 4 64.92 2.09 68.87 2.02 59.87 2.22 71.02 2.13 System 5 43.61 1.69 49.74 1.66 44.59 1.69 45.73 1.66
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