RC 612B 3 December Richard L. Hallett, MD
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1 RC 612B 3 December Richard L. Hallett, MD Chief, Cardiovascular Imaging Northwest Radiology Network Indianapolis, IN Adjunct Assistant Professor Radiology Stanford University Stanford, CA PERIPHERAL CTA
2 Outline CTA Acquisition Techniques ú Scan Acquisition ú Contrast Medium injection ú Reconstruction Clinical Efficacy in PAD Cost Handout: stanford.edu/~hallett choose folder RSNA2015
3 CTA Indications in PAD " Intermittent Claudication " Critical Limb Ischemia " Acute Ischemia (urgent) " Monitoring of Therapy (complications)
4 CTA Benefits Non-invasive (DSA) Spatial Resolution (MRA) Quick Acquisition (mostly) Operator Independent / Limitations Ionizing Radiation Nephrotoxic Contrast Spatial Resolution (DSA) No same session Tx No flow or pressure measurements
5 CTA Acquisition " Scan Acquisition " Contrast Medium Injection
6 CTA Scan Handout: stanford.edu/~hallett choose folder RSNA2015
7 Peripheral CTA Scan Acquisition / Recon Scanning Range 1 celiac artery (~T12) à toes ( cm) Optional Scanning Range 2 above the knees à toes Always pre-programmed, but only initiated by RT if no contrast in pedal vessels Recons: Thin, overlapped FOV = greater trochanters
8 Detector Configuration (mm) 16-Channel MDCT TI / 360 (mm) Table Speed (mm/s) Scanning Time (s) Anatomic coverage: cm slow slow fast fast ~35 mm/s ~65 mm/s 64-Channel MDCT very fast ~85 mm/s
9 Speed considerations for >64 slice CTA Outrunning Bolus Delayed filling of distal arteries
10 Free-Flap Planning CTA
11 Arteriomegaly preprogrammed, optional 2 nd acquisition 1st acquisition
12 Peripheral arterial bolus propagation Cumulative percentage of limbs Proportion of Limbs Table speed (mm/s) > ~ <.01 0 Relative risk to outrun bolus Aorto-popliteal transit speed (mm/s) Fleischmann D and Rubin GD. Radiology 2005,
13 Contrast Administration for peripheral CTA Fleischmann D. How to design injection protocols for multiple detector-row CT angiography (MDCTA). Eur Radiol Dec 1;15 Suppl 5:E60 5.
14 Contrast considerations for peripheral CTA Aorto-popliteal transit time: 4-24 sec (10 sec) ú Contrast speed: mm/s Biphasic injections yield more consistent enhancement profile Fleischmann et al. JVIR 2006, 17(1) 3-26.
15 Biphasic Injection for Peripheral CTA Fleischmann D. Eur. J. Radiol Mar 1;45 Suppl 1:S INPUT intravenous injection rate (ml/s) OUTPUT arterial enhancement (ΔHU) Biphasic Injection Phase I (surge phase) Phase II (continuing phase)
16 Patient Factors Arterial enhancement is inversely related to: Cardiac output (CO) Central blood volume (CBV) usually unknown CO (and CBV) correlate with body weight at least in pts. with ~ normal cardiac function Weight-based dosing helps consistency 1) Hittmair & Fleischmann, JCAT 2001
17 Integrated Contrast/Scan Protocol " Simple, weight based injection volumes and flow rates, combined with a fixed scan time or scan time/diagnostic delay sum. " automated bolus triggering " Use physiology not scanner speed " BENEFITS: " Decrease patient to patient variability in scan quality " Optimize imaging timing " Image all of the contrast given! " (Potentially) save contrast
18 STANFORD Integrated Scanning-Injection Protocol: (Siemens) Scan time: 40s for ALL patients (pitch variable) Inj.duration: 35s for ALL patients Delay: bolus triggering weight Biphasic Injection <55kg 20 ml (4.0mL/s) + 96 ml (3.2mL/s) <65kg 23 ml (4.5mL/s) ml (3.6mL/s) 75kg 25 ml (5.0mL/s) ml (4.0mL/s) >85kg 28 ml (5.5mL/s) ml (4.4mL/s) >95kg 30 ml (6.0mL/s) ml (4.8mL/s)
19 ST. VINCENT Integrated Scanning-Injection Protocol: (GE HD-750, VCT) Scan time: Variable (can t specify time) Add diagnostic delay to make 40 sec Inj.duration: 35s for ALL patients Delay: bolus triggering weight Biphasic Injection <55 kg 20 ml (4.0mL/s) + 96 ml (3.2mL/s) kg 25 ml (5.0mL/s) ml (4.0mL/s) >95 kg 30 ml (6.0mL/s) ml (4.8mL/s)
20 CTA Handout: stanford.edu/~hallett choose folder RSNA2015
21 CTA Reconstruction and Interpretation Use smaller FOV (Trochanter to trochanter) Use Iterative Reconstruction Recon thin, overlapping images and review in 3D ú VR / MIP overview then MPR, CPR ú 3-5 mm Axials in A/P Recon larger matrix 1024x1024 ** Fleischmann D, Hallett RL, Rubin GR. JVIR 2006, 17: 3-26.
22 1024 Matrix Examples
23
24 Efficacy of LE CTA in Handout: stanford.edu/~hallett choose folder RSNA2015
25 PAD Classification Fontaine Stage I Asymptomatic 0 Rutherford Classification I.C. IIa Mild Claudication (>200m walk) 1 IIb Moderate to Severe Claudication (<200m walk) III Ischemic Rest Pain 4 2 (moderate) 3 (severe) CLI IV Ulceration or Gangrene 5 (minor tissue loss) 6 (major tissue loss)
26 CTA: Diagnostic Performance vs. DSA Performance CT Channels Sens (95% CI) Spec (95% CI) (88-96) 98 ( (95-98) 98 (96-99) 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) Met R et al. JAMA 2009;301:
27 Diagnostic Performance: 64-slice CTA Symptomatic PAD: 242 pts, 7420 segments CTA and DSA performed For >70% stenosis: ú SENS/SPEC 96% PPV 98% NPV 99% ú No sig difference vs DSA findings ú Results similar in Ca++ vs. Non-Ca++ lesions Napoli A. Radiology Dec 1;261(3):
28 The Achilles Heel of Extremity CTA...
29 Predictors of Vascular Calcification " Above knee: 1 Severe PAD (Fontaine III-IV), Diabetes " Below Knee: 1 Renal Failure (esp. dialysis), Diabetes " Also: 2 Age, cardiac disease " If heavy, significant decrease in SENS/SPEC in calf 1 1 Meyer BC Eur Radiol (2010) 20: Ouwendijk R. Radiology (2006) 241,
30 Time-Resolved CTA - Runoff " Technique - Initial: " timing bolus at popliteal artery " 50 ml at 5 ml/ sec + 50 ml saline chaser " 12 low-dose CTA acquisitions over 30 sec " Rapid shuttle of detector array " Then: standard CTA runoff protocol " Significantly greater enhancement, less venous overlap " Significantly higher diagnostic confidence " Directly visualize asymmetric / delayed / diminished flow Sommer Eur. Radiol (2010) 20:
31 Clinical Utility of LE CTA in PAD Intermittent Claudication (IC) Critical Limb Ischemia (CLI) Handout: stanford.edu/~hallett choose folder RSNA2015
32 Intermittant Claudication (IC) Only ¼ progress clinically Amputation uncommon (unless diabetic) More likely ilio-femoral than trifurcation dz
33 Management of Intermittent Claudication by CTA Fontaine IIb patients, Tx decisions by TASC II criteria 57/58 correct Tx decision-making by CTA ú One CFA stenosis missed ú 29 endovasc/surg Tx ú 29 conservative mgmt Schernthaner R, et al. AJR 2007; 189:
34 Critical Limb Ischemia (CLI) Duration > 2 weeks rest pain, tissue loss, ulcers, gangrene (TASC II) ú Fontaine III / IV Higher incidence DM, trifurcation disease, comorbidities than IC
35 CTA assessment in CLI 41 pts, 1435 segments 64-CTA Fontaine IIb, III, IV 2.2% segments non-diagnostic ú not included in calculation ú 91% infrapop segments evaluable For > 50% stenosis: ú Sens 99% Spec 98% Acc: 98% Fotiadis N, et al. Clinical Radiology 2011; 66:
36 Management Decisions in CLI 28 pts, Fontaine IV 64-detector CTA 14/28 à endovascular and/or surg. Tx correct decision-making for interventions, amputation, and medical Tx based on DSA and Tx response Schernthaner R, et al. AJR 2009; 192:
37 Management of both IC and CLI by CTA Treated using TASC II guidelines ú 49 conservative TX ú 87 Endovascular ú 38 surgery ú 17 hybrid Tx recommendations from CTA same as DSA in all but ONE Napoli A. Radiology Dec 1;261(3):
38 Examples: Atherosclerotic Disease - Therapy Planning
39 Buttock Claudication Calcified Aortoiliac Disease Chang et al. JVIR Aug 1;22(8):
40 Post-TX Assessment by CTA
41 CTA for stent assessment Most stents assessable (76%) by CTA ú Gold / platinum markers ú Motion ú Strecker stent (Tantalum): Increased luminal density 2 If evaluable, sens/spec ~ 95% for significant in-stent restenosis (vs. DSA) 1 Li X, et al. Eur J Radiol 2010; Strotzer, Invest. Radiol. 2001:36(11)
42 CTA for assessment of complications
43 CTA for assessment of complications Willmann JK, et al. Radiology 2003; 229:
44 Acute R leg pain
45 Cost-Effectiveness of Handout: stanford.edu/~hallett choose folder RSNA2015
46 CTA as cost-effective care vs DSA " 2005: Randomized, controlled trial: 4-DCT vs DSA 1 " Dx confidence slightly lower with CTA (calcifications) " CT cost-effective and provides sufficient information for Tx planning " DSA costs (564 Euro) greater than CTA (363) 1 Kock, MC, et al. Radiology (2) pp
47 CTA as cost-effective care vs MRA 2005: RCT pts CTA vs MRA CTA/MRA utility similar CTA lower diagnostic costs /patient ú Average costs: $199 vs $627 ú Difference from imaging test itself, not from additional procedures Ouwendijk R, et al. Radiology 2005: 236:
48 CTA as cost-effective care (vs. US and MRA) 2008: DIPAD Trial (Multicenter RCT) 514 PAD pts, randomized to Doppler/MRA/CTA CTA and MRA: ú significantly higher diagnostic confidence ú less additional imaging needed Total costs lower for CTA Ouwendijk R, et al. AJR Am J Roentgenol. 2008;190:
49 Integrating CTA into cost-effective care " 2005: Randomized, controlled trial: 4-DCT vs DSA 1 " Dx confidence slightly lower with CTA (calcifications) " CT cost-effective and provides sufficient information for Tx planning " DSA costs ( 564+/- 210) greater than CTA (363 +/- 273) " 2007: Correct TX recommendations for I.C. 2 " 2009: Correct TX recommendations for CLI 3 1 Kock, MC, et al. Radiology (2) pp Schernthaner, R, et al. AJR 2007; 189: Schernthaner, R, et al. AJR 2009; 192:
50 Value-Added Info from CTA: GSV mapping 1-2 Pre-Op CTA: Adequate for evaluation of GSV size 1-2 ú SENS/SPEC >90% (better in thigh) ú Charge savings of ~ 50K at authors site alone 2 ú If GSV < 2 mm, then do Doppler US 1 DeFreitas DJ, et al. J Vasc Surg 2013; 57(1): Johnston WF, et al. J Vasc Surg 2012: 56(5)
51 Conclusions LE CTA is an accurate and costeffective tool for assessment of various forms of peripheral arterial disease Implementation of integrated CM/ scan protocol will improve consistency Clinical integration and uses will continue to expand
52 Thanks for your Attention! Special thanks to.. Dominik Fleischmann, Handout: stanford.edu/~hallett choose folder RSNA2015
PERIPHERAL CTA. Richard L. Hallett, MD
RC 812B Lakeside E351 1 December 2017 0830 1000 Richard L. Hallett, MD Chief, Cardiovascular Imaging Northwest Radiology Network Indianapolis, IN Adjunct Assistant Professor Radiology Cardiovascular Imaging
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Richard(L.(Hallett,(MD( ( Chief,(Cardiovascular(Imaging( Northwest(Radiology(Network( Indianapolis,(IN( ( Adjunct((Assistant(Professor( (Radiology( Stanford(University( Stanford,(CA( PERIPHERAL(CTA( RC#212B####
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