introduction to diagnostic imaging

8/18/2019 Introduction to Diagnostic Imaging

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VCA 252 Principles of

Diagnostic Imaging

Dr. LeeAnn Pack

566-084 ! 566-0"20Lpack#$pei.ca


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%&e Disco'er( of ) ra(s

* +il&elm Conra, oentgen* o'em/er 8 8"5

* +&ile orking in &is la/ - sa t&e glocoming from a p&osp&orescent screen

* Image, &is ife1s &an,

* "0 o/el Pri e for P&(sics

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a,iolog(3 a,iologist

%&e istor(* A A* In,i'i,$als &o looke, at plates an,

compare, t&em to t&e s7 an, a$tops(fin,ings

* AC - a,iologist no it& m$ltiple areasof specialt(

* ACV t&e 'eterinar( college

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% 9 :o$rnal

* :o$rnal &ic&&ig&lig&ts 'eterinar(

,iagnostic imaging

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;orms of Diagnostic Imaging

* Diagnostic a,iolog(3 a,iograp&( )-ra(s $se, to pro,$ce image! transmitte,

t&ro$g& patient tatic images D(namic images fl$oroscop( Contrast agents $se,

*


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* =ltrasonograp&( =ses so$n, a'es to pro,$ce image! transmitte,

en,ing o$t an, listening for ec&oes Internal arc&itect$re D(namic! = can not penetrate air or /one >perator ,epen,ent

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* Comp$te, %omograp&( =ses )-ra(s to pro,$ce an image! transmitte,

Cross sectional imaging o s$perimposition of str$ct$res e?$ires comp$ter manip$lation of images

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* $clear cintigrap&( =ses gamma ra(s to pro,$ce an image! emitte,

from t&e patient a,ioacti'e n$cli,e gi'en IV! per os! per rect$metc.

A/normal f$nction! meta/olic acti'it(! a/normal

amo$nt of $ptake Poor for anatomical information

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* @agnetic esonance Imaging =ses a strong magnetic fiel, an, ra,iofre?$enc(

a'es to image str$ct$res o ioni ing ra,iation (,rogen protons ater Cross sectional imaging

reat for soft tiss$e

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* a,iation %&erap( =ses ra,iation to treat an, palliate neoplastic an,

some /enign ,iseases Co/alt Linear Accelerators @$st &a'e special training

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+&at is an ) ra(B

Pro,$ction of ) ra(s* ;orm of 9@ ra,iation* All forms mo'e at t&e spee, of lig&t

* Var( in energ( an, a'elengt&* %&e( penetrate matter * Can ca$se fl$orescence of some atoms

* Can e7pose film* Can ca$se /iological ,amage

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%&e ) ra( %$/e

* Cat&o,e is t&e electron so$rce* %$ngsten filament

* egati'el( c&arge, conca'e c$p aro$n,filament

* ;ocal spot

* %&ermonic emission c$rrent applie, ire&eats $p an, electrons escape

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%&e ) ra( %$/e

* Ano,e is t&e target &ic& electrons strike* %$ngsten target

* tationar( Ano,e in large /lock of copper lots of &eat =se, in porta/le $nits

* otating Disc rotates &ic& sprea,s electrons aro$n, t&etarget t&$s less &eat /$il, $p

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%&e ) ra( %$/e

ote t&e 'ario$scomponents an,

remem/er &at t&e(,o.

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Ano,e eel 9ffect

* %&e s$rface of t&e ano,e is angle,* Allo s for /etter cooling an, maintains ,etail

* ) ra(s on cat&o,e si,e more intense* o o$l, t&is /e $se, in practiceB

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%&e est

* 97it in,o* o$sing

* ;iltration ra,iation safet(* Collimation

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mAs

* @illiampere-secon,* @illiampere - c$rrent applie, to t&e filament

* econ,s - time c$rrent as applie,* mAs ,etermines $antit( of ) ra(s

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kVp

* Eilo'oltage peak* Determines t&e spee, of electrons as t&e( &it

t&e target* ig&er spee, - more po er * ig&er spee, - increases n$m/er of 7 ra(s

* kVp ,etermines $alit( of ) ra(s

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introduction to diagnostic imaging

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