a dv a.,ultl{figtuf,uu Original Article

Department of Radiology

Raiavithi Hospital

Bangkok

dl v Ifl?::nilivTl:nu[?tGn?<ld- ozi auyt 7 iluuyt 2 ?'lqunlflil - cisillnil zeoa

Sawanpracharak Medical Journal

VoLz No.z May - August 2oto

rJ? ru r m Y{ fi d qiij a ul siYu o r n n r r n : a o ffauhJ oia u r nt o { r o n ryr : rin o u fi a r sr o dil

64 MDCT rosl:{yrrl-luto:tredPatient Dose undergoing Routine o+ Multi Detector computed

Tomography(MDCT) Examinations of Rajavithi Hospital

gfi airriarflm ?il.tl. (orurrerstafld) Sunee Lumlertdacha N{.Sc. (Medical-Imaging)I v4a

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-fr_V,uAcac?t?LU Ft?clrn:a{ran{r:nnarut{trnai 64 MDCTddaorufrFinut : n{ru.,:rui.rfiirenl:.:ner1u-rarlzed

I av av a \ t9 vguItuuntt?ou : nr:10ar2,,:n::ruruuulildr.,:uilrt u r -q-,,_---=i- v ..-4 - d a tA t v d^nQil9l ?ou1q : Hil? afi il1nr?ao?Er tn5o{ ra ncIr:EJ nailfrr rnoiff nril.:,rui.:fiim artqiq

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Ed- 4 {€\:ma{ *::

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ruanr:finur : crDt,o1Dlp radstunr:or::afi:us aa il:?{an uac ?ia.rfiarfirir66.1 mGy/1,085.9 mGy.cm, 72.6 mGyl1,gg1.S mGy.cm, 46.4 mGyt

1,019.2 mGy.cm ttns 56 mGyl1,Z7S.4 mGy.cm ntrurirrr-u rJ?lrrui.,:d

'[u rs a:fiu nu'ir rir rad erdtfi fi tit qo n'i'rfi rirmu pr

?or:nirrarapJ : il3ruTrui',rf,ri'zuarqduflo{n1:nr?0fi:us na m:?':afl uavdalfratd{U"

lfiiua.:n.jrdriruuq ar ru4drutuqjudarillaln nr:rf, anlfiIrl:InnonuuuZoA

01.: Fl1 Lo\: Q1Ulun:.:ta{ n1:dunu n?1eJ Ul??atdudl'ot"ne) n1:d$nu

uta,irurunrn(images) darunu

nlcnncu : irfrfi.,:r.ra Rh crDl,, rir olP

tylLAs {A.lmA.l finir z.sto.+-As{ilAtoaflsa\:n1:Ftr?qfi:w na m:?tafl uac ?iatfial frrir 2.5t0.4

mSv, S.3*1.0 mSv, 1Z.8=L4 mSv LLa-- ZB.4+2.7 mSv nrruri'roiu rda

rulielurfiHuriurirrlSurrui.,:flfl.rr.ra1rn:5.lumnato',:lotadta(IAEA) :cou

rltr.rrrui.:f, 6r.:6.:(DRLs)uaril^:urruitf, ftzuadfi n1:r1il{'luqrnnr:6nun

i The purpose of this study is to determine patient dose undergoing

routine 64 MDCT examinations

Department of radiology, Rajavithi Hospital'

Descriptive, ProsPective studY

Data were collected from 165 patients during 15-30 December, 2009'

There were 57 head, 13 n@k, (5 cfiest, and 50 abdomen examinations

at Raiavithi HosPital.

Scan patient under head, neck, chest and abdomen protocol and

record value of cTDld and DLP from 64 MDCT Scanner to calculate

value of effective dose (ED). Compare it to the standard effective dose

value from IAEA, DRLS, and other published effective dose.

Mean CTDI*', and DLP in head, neck, chest and abdomen were

66.1mGy/1085.3mGy'cm,77.6mGyt'l981'5mGy'cm,46'4mGy/

1019.2 mGy.cm, and 56 mGy/1779.4 mGy.cm, respectively. The

calculated mean ED in mSv and standard deviation in parenthesis of

head, neck, chest, and abdomen, were 2'510'4 mSv, 5'311'0 mSv'

17.811.4 mSv, and 28.4+2.7 msv, respectively. Mean effective dose

Absttact

Obiective

Setting

Design

Subiects

Method

Results

d,! v iufl 7 auuyt 2 1r.Ft.-d.a. 2553

rJilrorf'r?fi{rJ:aldiuorn,rr:o::oiir'lJdau,uio r,unry,:,luoufirrno{ o+ MDCT rofi:rr0rurn:rnifiPatienr Dose Undergoing Rourine 64 Mulri Dertrbr Computed Tomography (MDCD

Conclusion

Key words

oUYIUI

Exminal.ions of Rajavithi Hmpital 129

from this study were higher than standard effective dose value from

IAEA, DRLS, and other published effective dose in German.

This study showed that the calculated mean effective dose was higher

than standard effective dose value from IAEA, DRLS, and other published

effective dose. Because of the technical setting was manually, number

of scanning, scan length in volume and number of image scanning.

etfective dose, CTDl,o, DLp

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ED :effective dose fiurirurilu msv

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rJiuror:1fifi{rJraldirnrnnr:n:.:nn'r'lildr0rn:oor,on.!,:rinorfi:rnoi o+ MDcr ro$:ruorrra:rryi6Patient Dose Undergoing Rourine 64 Multi Detector Compured Tomogmphy (MDCD

Exminations of

d!6.

8Jnu?Eltuu cm

Conversion factor : rtlurir conversion

f acto r ? o { tt 0i a r a i'EJ a y n r il ri.r 6.r.,: 6.:Irr EJ

European Guidelines on Quality Criteria for

Ct(u) fimilrulflu msv/mcy.cma lau,nllnnHlil [tFt1 conversion factor

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1,981.5 mGy.cm, 46.4 mGyl1,O1 9.2 mGy.cm

uas 56 mGy/'l ,779.4 mGy.cm otrrua"rn-u)

(Fr1:1.:?1 3)

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sirurunrl,{ (images) da,lnudt#urflurf6'uxaJ-

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rjiumri.rfifrr{il:rldirrrnnr:n:rnrir'hldrurnSouonu:dnoufirrnoi ol uocr ro,rl:rraruranri6Patient Dose Lhdsgoing Routine 64 Multi Deteror Computed Tomogaphy (MDCI)

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zs+s. rrir 93-4.

4. American Association of Physicists in Medicine. Specification and acceptance

testing of computed tomography scanners-report no.39. New York American lnstitute

of Physics lnc; 1993. p.13-56.

ililmrf'rfrfi{rJroldilnrnnr:n:rodrl:.ld:uraisqon.rr:doolfirroof el &rDgr toil:rxorrra:rvffi-,) - - ) - Patient Dor Undergoing Routitre 6d Multi Detero. CoEputed Tomography (MDCDul] 7 0UU11 2 ?t.n.-d.a. 2553 Exminations of R4avthi Hmpiul 1

5. Menzel HG, Schibilla H, Teunen D, editor. European guidelines on quality criteria

for computed tomography EUR 16262. Proceeding of European Commission,s

Radiation Protection Action 1999; 1999 may; Brussels Belgium. Lrxembourg: European

Communities;1999.

6. Virginia TS, John EA, Raju s, Maria AS, Anchali K, Madan R, et al. Dose reduction

in CT while maintaining diagnostic confidence: diagnostic reference levels at routine

head, chest and abdominal CT-IAEA-coordinated research project. Radiology

2006;240:828-34.

7. Committee 3 of the lnternational Commission on Radiological protection (lCRp).

Diagnostic reference levels in medical imaging : review and additional advice. A web

Module by the ICRP committee. 1999 [cited 2010 Aug 2]. Available from: URl:http/i

www. icrp.org/docs/drl_for_web. pdf

8. Lewis MA, Edyven S. Patient dose reduction in CT. The British Joumalof Radiology

2005;78:880-3.

9. David J, Brenner DJ, Eric J, Hall D. Computed tomography : an increasing source of

radiation exposure 2007 ;357 :2227 -94.

10. Brenner DJ, Elliston CD. Estimated radiation risks potentially associated with full-body

CT screening. Radiolo gy 2004;282:735-9.

11. Galanski M, Hidajat N, Maier w, Schmidt TH. Radiation exposure in computed

tomography. ln: Nagel HD, editor. Radiation exposure in computed tomography.

4n ed. Hamburg: CTB Publications; 2002. p.2O-3.

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