Toshiba Medical Systems Corporation

SPECT Part.1 ()

Toshiba Medical Systems Corporation

n l 1 l 2 l 3 l 4

n l l l

n l

u u u

l n

l l

n l l l

2

1

180 90

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(SPECT)

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1

Toshiba Medical Systems Corporation

Toshiba Medical Systems Corporation

(PMT)

533x387mm 3PMT53 2PMT 6

E.CAM

3PMT (76.2mm)

2PMT (50.8mm)

NaI

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()

(X,Y)(Z)

NaI

X = Pi Wi

Pi Z = Pi

P1 W1:1

P2 W2:2

P3 W3:3

P4 W4:4

P5 W5:5

P6 W6:6

P7 W7:7

P8 W8:8

Pi Wi

Toshiba Medical Systems Corporation

(X,Y)(Z)

X = Pi Wi Pi

P1

P2

P3 3

P4 3

P5 2

P6 1

P7 0

P8 0

= 1x1+2x2+3x3+3x4+2x5+1x6+0x7+0x8 1+2+3+3+2+1+0+0 = 3.5 2(X,Y)

Pi

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(Scatter)

140keV 120keV 100keV

70keV

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Scatter

Primary

Energy

Coun

ts

Photo peak

(Primary)

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keV 140 133 147

NaI10%

(FWHM)

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Scatter

Total Primary

Energy

Cou

nts

Photo peak

1520%(Primary)(Scatter)

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140keV7.5% 140keV2.5%

1min 13sec 2min 34sec

600k counts 99mTc

keV 140 130 150

7.5%

2.5%

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93keV 185keV 93+185keV

93keV Scatter 185keV Scatter 93+185keV Scatter Free

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n l (150/170keV)l (300keV)l (400keV)l (511keV)

n /l l l l

n l l l l l

AB

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24.1mm

1.11mm

0.16mm LEHR

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Toshiba Medical Systems Corporation

LEHR

LMEGP

10cm 20cm

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140KeV 360KeV 360KeV

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X

LEHR LMEGP MELP

120kV 3m

FWHM:7.5 mm 5.5 cpm/kBq

FWHM:10.3 mm 8 cpm/kBq

FWHM:12.5 mm 8.4 cpm/kBq

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67Ga 93keV

185keV 296keV)

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123I

TOSHIBA LMEGP

TOSHIBA LEHR

Siemens LEHR

123I-BMIPP

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()

n Ri Intrinsic Resolution) l

n Rg Geometric Resolution) l l l 10cm

n (Rs System Resolution) l () l 10cm

n SPECT l SPECT l CenterRadialTangential3 l

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FWHM & FWTM

FWHM (Full Width at Half Maximum)

FWTM (Full Width at Tenth Maximum)

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FWHM

FWHMFWHM

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XYZ XYZ

2

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XYZ XYZ

A B

10cm

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XYZ XYZ

10cm

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SPECT

()

()

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Rs = Ri2 + Rg2 Rs Ri Rg

(1)Ri = 3.8mm, Rg = 6.5mm Rs = 7.5mm

(2)

Ri = 4.5mm, Rg = 6.5mm Rs = 7.9mm

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0

2

4

6

8

10

12

14

16

18

5 10 15 19

(mm)

(mmFWHM)

LMEGPLEAPLEHR

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0cm 5cm 10cm 15cm 20cm 25cm 30cm 35cm

LEHR 7.5mm FWHM@10cm

LMEGP 10.3mm FWHM@10cm

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7.5mm 8.6mm

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SPECT

center radial

tangential1mm

SPECTFWHM

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SPECT

@10cm[mm] [cpm/kBq]

A LEHR 7.4 5.5

LMEGP 10.3 8.0

B LEHR 7.4 5.5

LMEGP 10.6 8.7

C LEHR 7.4 5.4

ELEGP 10.0 8.6

D VXHR 7.4 3.8

VXGP 7.8 4.2

http://www.jsnmt.umin.ne.jp/contents/wghoukoku/standard/kikiinfo.html

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n SPECT1315cmSPECT912mm34mm

n SPECT2025cmSPECT1518mm56mm

SPECT(FWHM)1/3

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(SymbiaE)

64 128 256 512 FOV

1 9.60 4.80 2.40 1.20 533

1.23 7.80 3.90 1.95 0.98 500

1.45 6.62 3.31 1.66 0.83 424

1.78 5.39 2.70 1.35 0.67 345

2 4.80 2.40 1.20 0.60 307

2.29 4.19 2.10 1.05 0.52 268

2.67 3.60 1.80 0.90 0.45 230

3.2 3.00 1.50 0.75 0.38 192

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SPECT

20cm 25cm

25

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(SymbiaE)

64 128 256 512 FOV

1 9.60 4.80 2.40 1.20 533

1.23 7.80 3.90 1.95 0.98 500

1.45 6.62 3.31 1.66 0.83 424

1.78 5.39 2.70 1.35 0.67 345

2 4.80 2.40 1.20 0.60 307

2.29 4.19 2.10 1.05 0.52 268

2.67 3.60 1.80 0.90 0.45 230

3.2 3.00 1.50 0.75 0.38 192

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SPECT

422mm (6.6mm)

344mm (5.4mm)

SPECTsmall heart

:166cm :68kg

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SymbiaE

1.23 1.45 1.78

128128 3.9mm 3.3mm 2.7mm

6464 7.8mm 6.6mm 5.4mm

498mm 422mm 344mm

SymbiaE/E.CAM6464 1.78

()

5.4mm

RI

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Emission & Transmission

Transmission

Emission

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180360

180 360

J Nuci Med 23: 661, 1982

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A1 A2

B1 B2

360 180A1/A2 1.00 1.09 B1/B2 1.01 1.21

Tc-99m 360 180A1/A2 1.03 1.12 B1/B2 1.02 1.27

Tl-201 20cm 360180

180SPECT acquisition is generally preferred for both 201Tl and 99mTc protocols because of the higher contrast and resolution of the reconstructed images and greater patient throughput, although the use of 360acquisition has been advocated on the basis of its superior image uniformity and greater immunity to artifacts. Guido Germano. Technical Aspects of Myocardial SPECT Imaging. J Nucl Med.2001;42:1499-1507

180360

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(180)

44-224deg 92-272deg 136-316deg 180-360deg

Toshiba Medical Systems Corporation

180360

360 180

RAO45

LPO45

LAO45

180RAO45LAO45LPO45

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180360

360 180

180

Toshiba Medical Systems Corporation

180360

360 180

11

360

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180360 ()

Kenichi Nakajima, et al. Ann Nucl Med (2007) 21:505511

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