chief, cardiovascular imaging northwest radiology network ...hallett/rsna2017/rc812b... · 105 –...
TRANSCRIPT
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PERIPHERALCTA
RichardL.Hallett,MDChief,CardiovascularImagingNorthwestRadiologyNetworkIndianapolis,INAdjunctAssistantProfessor–RadiologyCardiovascularImagingSectionStanfordUniversityStanford,CA
RC812BLakesideE351 1December2017 0830–1000
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Outline
§ GoalsofLECTA§ CTAAcquisitionTechniques
ú ScanAcquisitionú ContrastMediuminjection
§ ClinicalEfficacyinPAD
§ Pre-andPost-InterventionImaging
Handout:stanford.edu/~hallettchoosefolder“RSNA2017”
@CTterrific
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GoalsofCTAimaginginPAD
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Indications (n) (2001-05)
DSA
DiagnosisandStagingofPAD
=symptoms+ABI
poorcorrelationofsymptomsandABIwith
number,locationandseverityoflesions
Example:calfclaudicationcanbecausedby
isolateddiseaseorcombinationofiliacand/or
femoropopliteallesions
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Indications (n) (2001-05)
DSA
RoleofCTAImagingisNOTdiagnosis/
staging
TheroleofCTAistomaplesions
tothepatient‘ssymptoms
fortreatmentplanning
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TypeAendovascular
TASCIICriteriaTransatlanticSocietyConsensus(2007)
TypeB
TypeC
TypeDsurgical
aortoiliac femoropopliteal
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IndicationsforCTAinPAD
• IntermittentClaudication
• CriticalLimbIschemia
• AcuteIschemia(urgent)
• MonitoringofTherapy(complications)
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Whichlesionsmatter?
TreatmentSegment AKA/utility
Aorto-iliac “Inflow”,“Supra-inguinal”
CommonFemorala. Bypasstargetandsource
ProfundaFemorisa. Importantcollateralsw/SFAocclusion
Importants/pamputation
Femoro-popliteal
(SFA-Pop)
“Infra-inguinalrunoff”
Notelevelofreconstitutionabove(P1)or
below(P3)knee
Trifurcationvessels “Infra-poplitealrunoff”
OnlyrelevantinCLIpts(notIC)
Pedalaa. “2vesselscrossingankle”(DP,PT)
OnlyinCLI/bypasstargets
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CTAScanAcquisition
Handout:stanford.edu/~hallettchoosefolder“RSNA2017”
@CTterrific
• ScanAcquisition• ContrastMediumInjection
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Optional Scanning Range 2 above the knees à toes Always pre-programmed, but only initiated by RT if no contrast in pedal vessels
Scanning Range 1 celiac artery (~T12) à toes (105 – 130 cm)
Recons: Thin, overlapped FOV = greater trochanters
PeripheralCTA
ScanAcquisition/Recon
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DetectorConfiguration(mm)
TI/360°(mm)
TableSpeed(mm/s) ScanTime(s)
16-ChannelMDCT
16×.75 18 36 30-40
16×.63 18 35 30-40
16×1.5 33 66 15-20
16×1.25 35 70 15-20
~35 mm/s slow slow
fast fast
Anatomic coverage: 105 – 130cm
64-ChannelMDCT
64×.63 55 92 11-14
64×.60 29 78 13-17 fast very
~85 mm/s
~65 mm/s
FLASH Modes
128x2x0.60 128 458 <3
192x2x0.60 184 737 <2 BLAZING
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Speedconsiderationsfor>64sliceCTA
§ OutrunningBolus
§ Delayedfillingofdistalarteries
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Free-FlapPlanningCTA
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preprogrammed, optional 2nd acquisition
Arteriomegaly
1st acquisition
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Table speed (mm/s)
0
0.2
0.4
0.6
0.8
1
0 30 60 90 120 150 180
vAO->POP (mm/s)
Cumu
lative
Pr
opor
tion o
f Lim
bs
0
0.2
0.4
0.6
0.8
1
Relat
ive R
isk to
Ou
trun B
olus
Cum
ulat
ive
pe
rcen
tage
of l
imbs
Table speed (mm/s)
Rel
ativ
e ris
k to
ou
trun
bolu
s
Aorto-popliteal transit speed (mm/s)
Table speed (mm/s)
0
0.2
0.4
0.6
0.8
1
0 30 60 90 120 150 180
vAO->POP (mm/s)Cu
mulat
ive
Prop
ortio
n of L
imbs
0
0.2
0.4
0.6
0.8
1
Relat
ive R
isk to
Ou
trun B
olus
Peripheralarterialboluspropagation
< .01
~.33
> .50
Fleischmann D and Rubin GD. Radiology 2005, 1076-1082
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Contrastconsiderationsfor
peripheralCTA
§ Aorto-poplitealtransittime:4-24sec(10sec)
ú Contrastspeed:29-177mm/s
§ Biphasicinjectionsyieldmoreconsistent
enhancementprofile
Fleischmann et al. JVIR 2006, 17(1) 3-26.
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0
100
200
300
400
0 8 16 24 32 40 48 56 64 72 80
0
2
4
6
8
1 9 17 25 33
INPUT intravenous injection rate (mL/s)
OUTPUT arterial enhancement (ΔHU)
Phase I (surge phase)
Phase II (continuing phase)
Biphasic Injection for Peripheral CTA
0
100
200
300
400
0 8 16 24 32 40 48 56 64 72 80
0
100
200
300
400
0 8 16 24 32 40 48 56 64 72 80
0
100
200
300
400
0 8 16 24 32 40 48 56 64 72 80
0
2
4
6
8
1 9 17 25 33
0
2
4
6
8
1 9 17 25 33
0
2
4
6
8
1 9 17 25 33
Biphasic Injection
Fleischmann D. Eur. J. Radiol. 2003 Mar 1;45 Suppl 1:S88–93.
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PatientFactors
§ Arterialenhancementisinverselyrelatedto:§ Cardiacoutput(CO)
§ Centralbloodvolume(CBV)
§ CO(andCBV)correlatewithbodyweight
§ atleastinpts.with~normalcardiacfunction
§ Weight-baseddosinghelpsconsistency
1) Hittmair & Fleischmann, JCAT 2001
usually unknown
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IntegratedContrast/ScanProtocol
Simple,weightbasedinjectionvolumesandflowrates,combinedwithafixedscantimeorscantime/diagnosticdelaysum.
automatedbolustriggering
Usephysiology(notscannerspeed)
BENEFITS:
Decreasepatienttopatientvariabilityinquality
Optimizeimagingtiming
Imageallofthecontrastgiven!
(Potentially)savecontrast
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IntegratedScanning-InjectionProtocol:(Siemens)
§ Scantime: 40sforALLpatients(pitchvariable)
§ Inj.duration:35sforALLpatients§ Delay: bolustriggering
weight Biphasic Injection <55kg 20 mL (4.0mL/s) + 96 mL (3.2mL/s) <65kg 23 mL (4.5mL/s) + 108 mL (3.6mL/s)
75kg 25 mL (5.0mL/s) + 120 mL (4.0mL/s) >85kg 28 mL (5.5mL/s) + 132 mL (4.4mL/s) >95kg 30 mL (6.0mL/s) + 144 mL (4.8mL/s)
5 sec FAST + 30 sec SLOWER
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ST.VINCENTIntegratedScanning-Injection
Protocol:(GEHD-750,VCT)
§ Scantime: Variable(can’tspecifytime)
§ Add�diagnosticdelay�tomake40sec
§ Inj.duration:35sforALLpatients§ Delay: bolustriggering
weight Biphasic Injection <55 kg 20 mL (4.0mL/s) + 96 mL (3.2mL/s)
55-95 kg 25 mL (5.0mL/s) + 120 mL (4.0mL/s) >95 kg 30 mL (6.0mL/s) + 144 mL (4.8mL/s)
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SpecialScenarios
§ RenalDysfunction§ ContrastMediumSavings
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AdaptationsforRenalDysfunction:
LESSISMORE
§ DecreaseCMdose
§ DecreasekV§ Decreasescanrange
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Background:
§ ThereisclinicalevidencethatratioofCMto
eGFRcanpredictCINoccurrence
§ Bestdiscriminator:CMdose(mL)>3.7xeGFR
ú Correspondsto1xeGFRingramsofiodine(assuming
370mgI/mLcontrast)
§ ThereisalsoevidencethatCINriskisnot
increasedforvolumeslessthan2.0mLxeGFR
(PCIdata)
Gurm HS, et al. J Am Coll Cardiol 2011; 58:907-14
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eGFR-basedCMcalculation
§ DetermineeGFR:http://touchcalc.com/e_gfr
§ IfeGFR<60ml/min/m2(e.g.CKD):
MAXvolume(mL)=eGFRx2
(thisisfor75kgbodyweight)
Then,adjustforBW:
MAXvolume=eGFRx2x(BW/75)
** Low concentration CM (300 mgI-/mL)
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Cou
rtesy
: D. F
leis
chm
ann,
MD
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LowkVpImaging
§ K-edgeofiodine:33.2KeV§ Attenuationofiodineincreasesby25%from120to100
kVp,andagainfrom100to80kVp
§ Each“step”downinkVpcorrespondsto~25%lessCM
needed
140kVp 120kVp 100kVp 80kVp 70kVp
IodineAttenuation
(comparedto120kVp)-25% - +25% +50% +70%
Chapter 3: Contrast Medium Injection Technique. In: Schoepf and Meinel, eds. Multidetector-Row CT of the Thorax (2016)
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LowkVpimaging-modifications
§ Keepinjectionduration,scan-time,andscan
delaysconstant
§ Foreach“step”downinkVp,increasemAs
30-50%
§ NoiseControloptions:ú Slowpitchdown
ú Slowgantryrotationtime
ú Keepnoiseindexthesame
ú MatchCTDIvolbetweenprotocols
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CTAReconstruction
Handout:stanford.edu/~hallettchoosefolder“RSNA2017”
@CTterrific
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Tips:CTAReconstruction
§ UsesmallerFOV(trochantertotrochanter)
§ UseIterativeReconstruction§ Reconthin,overlappingimagesandreviewin3D
ú VR/MIPoverviewthenMPR,CPR
ú 3-5mmAxialsinA/P
§ Reconlargermatrix–1024x1024
** Fleischmann D, Hallett RL, Rubin GR. JVIR 2006, 17: 3-26.
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TheAchilles�HeelofExtremityCTA......
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PredictorsofVascular
Calcification
Aboveknee:1SeverePAD(FontaineIII-IV),
Diabetes
BelowKnee:1RenalFailure(esp.dialysis),
Diabetes
Also:2Age,cardiacdisease
Ifheavy,significantdecreaseinSENS/SPECin
calf11 Meyer BC Eur Radiol (2010) 20:497-505 2 Ouwendijk R. Radiology (2006) 241, 603-608
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EffectofCalciumon
Intervention
§ Predictoroffailuretocrosslesion:100%
calcificationonpre-op
CTA
ú NOT:
multipleocclusions,
negativeremodeling
percentagecalcificationItoga NK et al. J Vasc Surg 2017, 835-43.
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Time-ResolvedCTA-Runoff
• Technique
timingbolusatpoplitealartery
50mLat5mL/sec+50mLsalinechaser
12low-doseCTAacquisitionsover30sec
Rapid�shuttle�ofdetectorarray
• Then:standardCTArunoffprotocol
• Significantlygreaterenhancement,lessvenousoverlap
• Significantlyhigherdiagnosticconfidence
• Directlyvisualizeasymmetric/delayed/diminishedflow
Sommer Eur. Radiol (2010) 20: 2876-2881
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EfficacyofLECTAinPAD
Handout:stanford.edu/~hallettchoosefolder“RSNA2017”
@CTterrific
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Detection of >50% Stenosis or Occlusion By Anatomical Region
Vessels Sens(95%CI) Spec(95%CI)
Aortoiliac 96(91-99) 98(95-99
Femoropopliteal 97(95-99) 94(85-99)
Trifurcation 95(85-99) 91(79-97)
CTA:DiagnosticPerformancevs.DSA
CTChannels Sens(95%CI) Spec(95%CI)
2-4 92(88-96) 98(95-99
16-64 97(95-98) 98(96-99)
Performance
Met R et al. JAMA 2009;301:415-424
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DiagnosticPerformance:64-sliceCTA
§ SymptomaticPAD:242pts,7420segments
§ CTAandDSAperformed
§ For>70%stenosis:
ú SENS/SPEC96%PPV98%NPV99%
ú NosigdifferencevsDSAfindings
ú ResultssimilarinCa++vs.Non-Ca++lesions
Napoli A. Radiology. 2011 Dec 1;261(3):976–86.
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CTADirectedManagementof
IntermittentClaudication
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§ FontaineIIbpatients,TxdecisionsbyTASCIIcriteria
§ 57/58correctTxdecision-makingbyCTA
ú OneCFAstenosismissed
ú 29endovasc/surgTxú 29conservativemgmt
Schernthaner R, et al. AJR 2007; 189:1215-1222
CTADirectedManagementof
IntermittentClaudication
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CTADirected
ManagementofCLI
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§ 41pts,1435segments
§ 64-CTA§ FontaineIIb,III,IV§ 2.2%segmentsnon-diagnostic
ú notincludedincalculationú 91%infrapopsegmentsevaluable
§ For>50%stenosis:ú Sens99% Spec98% Acc:98%
Fotiadis N, et al. Clinical Radiology 2011; 66: 945-52
CTADirected
ManagementofCLI
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ManagementofbothICandCLIbyCTA
§ TreatedusingTASCIIguidelinesú 49conservativeTXú 87Endovascularú 38surgeryú 17hybrid
§ TxrecommendationsfromCTAsameasDSA
inallbutONE
Napoli A. Radiology. 2011 Dec 1;261(3):976–86.
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Examples:AtheroscleroticDisease
-TherapyPlanning
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CTAforpost-treatmentfollowup
Willmann JK, et al. Radiology 2003; 229: 465-474.
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Post-TXAssessmentbyCTA
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CTAforstentassessment
§ Moststentsassessable(76%)byCTA
ú Gold/platinummarkers
ú Motion
ú Streckerstent(Tantalum):Increasedluminaldensity2
§ Ifevaluable,sens/spec~95%forsignificantin-stentrestenosis(vs.DSA)
1 Li X, et al. Eur J Radiol 2010; 98-103 2 Strotzer, Invest. Radiol. 2001:36(11)
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CTAfor
assessmentof
complications
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AcuteRlegpain
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Value-AddedInfofromCTA:
GSVmapping1-2
§ Pre-OpCTA:Adequatefor
evaluationofGSVsize1-2
ú SENS/SPEC>90%(betterin
thigh)
ú Chargesavingsof~50Katauthorssitealone2
ú IfGSV<2mm,thendo
DopplerUS1DeFreitas DJ, et al. J Vasc Surg 2013; 57(1): 5-55. 2Johnston WF, et al. J Vasc Surg 2012: 56(5) 1331-37.
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Conclusions:PeripheralCTA
§ GoalofperipheralCTA:maplesionstosymptomstodirecttherapy
(Answertheclinicalquestions)
§ IntegratedCM/scanprotocolimprovesconsistency
Injectlong,scanslow
Weight-basedCMdosing
§ CTAisusefulforpre-opplanningandpost-opevaluation
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§ Specialthanksto…..
DominikFleischmann,MD
ThanksforyourAttention!
Handout:stanford.edu/~hallettchoosefolder“RSNA2017”
@CTterrific