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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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Figure 1 : Attenuation of gamma-rays of intensity Io incident on<br />

(a) a homogeneous slab,<br />

(b) a non-homogeneous slab, and<br />

(c) homogeneous and non-homogeneous slabs having identical ray<br />

sums.<br />

X-RAY /<br />

TUBE \f<br />

1st<br />

TRANSLATI<strong>ON</strong><br />

(a)<br />

DETECTOR<br />

1st<br />

TRANSLATE<br />

1° INCREMENTS<br />

60th ""^<br />

TRANSLATI<strong>ON</strong> \<br />

(b)<br />

P 120th<br />

\ TRANSLATI<strong>ON</strong><br />

Figure 2 : A schematic illustration of a translate-rotate CT scanner.<br />

(a) The source and detector are first translated relative to the<br />

object. Each parallel line represents one ray sura.<br />

(b) Multiple projections are obtained by rotating the source and<br />

detector around the object.

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