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(Click for frequent words.) 70 CT angiography 69 Computed tomography 69 helical CT 69 multislice 69 spiral computed tomography 68 coronary CTA 68 computed tomography scans 68 conventional angiography 68 multislice CT 68 colonography 67 multidetector row 67 coronary computed tomography 67 invasive coronary angiography 67 angiography CTA 67 computed tomographic 66 transesophageal echocardiography 66 MDCT angiography 66 multidetector CT 66 polyp detection 66 gadolinium enhanced 66 MSCT 66 CT angiogram 65 Radical prostatectomy 65 coronary angiography 65 computed tomography CT scans 65 abdominal computed tomography 65 coronary CT angiography 65 transvaginal sonography 65 MDCT 65 Magnetic resonance 64 transrectal ultrasound guided 64 Angiograms 64 pelvic lymphadenectomy 64 FDG-PET/CT 64 DEXA scan 64 excisional biopsy 64 fine needle aspiration 64 cytoreductive surgery 64 advanced neoplasia 64 radical nephrectomy 64 malignant polyps 64 transrectal 63 perioperative morbidity 63 Virtual colonoscopy 63 Breast Specific Gamma 63 abdominal ultrasound 63 Computed tomographic 63 VATS lobectomy 63 positron emission 63 sentinel node biopsy 63 MR angiography 63 endometrial biopsy 63 chest radiography 63 pelvic ultrasound 63 EUS FNA 63 pulmonary angiography 63 contralateral breast 63 CT computed tomography 63 axillary dissection 63 adenomatous polyps 62 thyroglobulin 62 FDG PET CT 62 transesophageal 62 OPCAB 62 computerized tomography scan 62 thyroid nodules 62 balloon angioplasties 62 catheter angiography 62 transthoracic 62 Ultrasonography 62 cardiac computed tomography 62 advanced adenomas 62 HoLEP 62 Capsule endoscopy 62 coronary angiogram 62 conventional coronary angiography 62 colonoscopic 62 Computed tomography CT 62 flexible sigmoidoscopy 62 electron beam computed tomography 62 needle aspiration 62 CT angiography CTA 62 Computerized tomography 62 COR Analyzer 62 EBUS 62 myocardial perfusion 62 enhanced MR angiography 62 spiral CT scan 62 computerized tomographic 62 Radiofrequency ablation 62 mammographic 62 LV dysfunction 62 colorectal neoplasms 62 acetabular fractures 62 transcranial Doppler 62 Doppler ultrasound 61 FDG PET imaging 61 electrocardiography 61 carotid artery blockage 61 upper endoscopy 61 hematopoietic cancers 61 F FDG PET 61 sentinel lymph node biopsy 61 ovarian malignancy 61 prostate cancer CaP 61 pre operatively 61 hepatic lesions 61 Abdominal ultrasound 61 nonischemic 61 ASCUS 61 Magnetic resonance imaging 61 peritoneal carcinomatosis 61 computerized tomography scans 61 optical colonoscopy 61 wedge resection 61 oncologic outcomes 61 barium enemas 61 nephrectomy 61 intraductal 61 Cystoscopy 61 mediastinoscopy 61 Breast conserving 61 cytological 61 Cardiac catheterization 61 arthrography 61 #F FDG 61 prostate TURP 61 SLNB 61 axillary lymph nodes 61 fluoroscopically guided 61 pathologic examination 61 transthoracic echocardiography 61 mucinous 61 coronary calcium 61 endosonography 61 preoperative chemotherapy 61 cardiac perfusion 61 myocardial viability 61 computed tomography angiography 61 diagnostic modality 61 thoracoscopic lobectomy 61 intensity modulated radiotherapy IMRT 60 surgical biopsy 60 fluoroscopy guided 60 chest radiographs 60 transabdominal 60 lymphadenectomy 60 catheter ablations 60 core needle biopsies 60 metastatic lymph nodes 60 Pulse oximetry 60 computed tomography CT 60 FDG PET scans 60 PSA nadir 60 atypical hyperplasia 60 computerized tomography CT 60 leiomyomas 60 transrectal ultrasound 60 varicoceles 60 ischemic lesions 60 laparoscopic cholecystectomy 60 Androgen deprivation therapy 60 lung nodule 60 #Gy 60 lymph node removal 60 CT colonography CTC 60 stratifying patients 60 endoscopic resection 60 ductal 60 computed tomographic scans 60 Endoscopic ultrasound 60 endoscopic retrograde 60 endoscopic ultrasound 60 radionuclide imaging 60 Doppler sonography 60 Adjuvant chemotherapy 60 chemoembolization 60 pre cancerous lesion 60 invasive angiography 60 Flexible sigmoidoscopy 60 preoperative staging 60 carotid ultrasound 60 venography 60 surgical biopsies 60 prostate carcinoma 60 asymptomatic carotid stenosis 60 angiography CCTA 60 abdominal hysterectomy 60 postoperative chemotherapy 60 perfusion imaging 60 Enhanced External Counterpulsation 60 renal cell carcinomas 60 Intra operative 60 Bone density 60 radioiodine therapy 60 prostate biopsy 60 radiofrequency catheter ablation 60 spinal metastases 60 underwent coronary angiography 60 EBUS FNA 60 coronary blockages 60 postoperative complication 60 EBCT 60 CT perfusion 60 pulmonary nodules 60 dimensional echocardiography 60 x ray angiography 60 endoscopic retrograde cholangiopancreatography ERCGrant Parpan 60 nodal metastasis 60 abdominal pelvic 60 laparoscopic fundoplication 60 sentinel nodes 60 trabeculectomy 60 computed tomography scanning 60 hip resurfacing arthroplasty 60 echocardiographic 60 PET CT scan 59 Computerized Tomography 59 stress echocardiography 59 proton MR spectroscopy 59 Imaging BSGI 59 vascular anatomy 59 tomography scans 59 axillary lymph node dissection 59 Cardiopulmonary bypass 59 ultrasonographic 59 duplex ultrasonography 59 diagnostic angiography 59 arteriography 59 angiographically 59 invasive biopsy 59 troponin T 59 hematuria 59 needle biopsies 59 urine cytology 59 Cardiac CT 59 Echocardiogram 59 x ray computed tomography 59 color Doppler 59 computerized tomography 59 coronary vessels 59 nephron sparing surgery 59 cardiac CT angiography 59 computed tomography CT angiography 59 X ray angiography 59 abdominal ultrasounds 59 Angiographic 59 angiography 59 bone marrow aspiration 59 neoadjuvant therapy 59 histopathologic findings 59 PET CT imaging 59 Coronary CTA 59 slice CT scanners 59 hepatectomy 59 polypectomy 59 Positron emission tomography PET 59 undergoing radical prostatectomy 59 histologically proven 59 extracolonic findings 59 Sonographic 59 chemoradiation therapy 59 paracentesis 59 Doppler echocardiography 59 photon laser 59 decompressive surgery 59 deCODE ProstateCancer TM 59 fibroadenomas 59 laparoscopic nephrectomy 59 Surgical excision 59 cardiopulmonary bypass CPB 59 carotid artery stenosis 59 coronary artery stenosis 59 biopsied tissue 59 conventional colonoscopy 59 incisional biopsy 59 histopathologic examination 59 computerized tomography CT scan 59 positron emission tomography scans 59 carotid stenosis 59 preserved ejection fraction 59 flurpiridaz F 59 Biopsies 59 Prostate Specific Antigen PSA 59 Computed Tomography CT scans 59 intraventricular 59 hepatic arterial 59 TRUS biopsy 59 bone scintigraphy 59 nodal metastases 59 catheterisation 59 cervical lymph nodes 59 opacification 59 digital rectal examination 59 endometrial carcinoma 59 DEXA scans 59 pulmonary metastasis 59 Accelerated Partial Breast Irradiation 59 D dimer 59 serum PSA 59 Positron emission tomography 59 specific antigen PSA 59 MR imaging 59 sonographically guided 59 Sentinel node biopsy 59 hamartomas 59 abdominal CT scans 59 #.#ng/ml 59 ECG gated 59 Ultrasound scans 59 plain radiographs 59 gated SPECT 59 Coronary artery bypass 59 EBRT 59 fluorescein angiography 59 less invasive laparoscopic 59 transrectal ultrasonography 59 BSGI MBI 59 Tomography SPECT 59 revascularization procedure 59 preoperative PSA 59 FDG PET 59 coronary calcification 59 Neoadjuvant chemotherapy 59 lung nodules 59 nonmelanoma skin cancers 59 conformal radiotherapy 59 coronary arteriography 59 fluoroscopic 59 SPECT CT 58 histopathologic 58 cardiac catheterisation 58 radical cystectomy 58 NMIBC 58 salpingo oophorectomy 58 perioperative mortality 58 esophagogastric 58 Cholecystectomy 58 cerebral angiography 58 transcranial Doppler ultrasound 58 endoscopic ultrasonography 58 colon rectal 58 deCODE BreastCancer TM 58 Computed tomography CT scans 58 computed tomographic scan 58 minimally invasive technique 58 esophagogastroduodenoscopy 58 color Doppler ultrasound 58 detecting polyps 58 medically inoperable 58 chest radiograph 58 axillary lymph node 58 benign prostatic hyperplasia enlarged 58 X ray mammography 58 color Doppler sonography 58 guided percutaneous 58 sestamibi 58 tortuosity 58 x ray mammography 58 resectable 58 postoperative morbidity 58 CT Angiography 58 cardiac magnetic resonance 58 renal tumors 58 transurethral resection 58 esophagectomy 58 percutaneous biopsy 58 malignant growths 58 adrenalectomy 58 benign nodules 58 elective PCI 58 sentinel lymph node 58 arterial grafts 58 varicocele 58 appendiceal 58 basal cell cancers 58 Lymph node 58 ductal lavage 58 clinically localized prostate 58 3T MRI 58 fundus photography 58 lymph node dissection 58 Color Doppler 58 computed tomography CT scan 58 Positron Emission Tomography PET 58 unresectable tumors 58 inguinal hernia repair 58 orchiectomy 58 Bronchoscopy 58 cardiac angiography 58 adjuvant radiotherapy 58 pelvic lymph nodes 58 computed tomography scan 58 endoscopic ultrasound EUS 58 keratoplasty 58 Coronary angiography 58 Cystectomy 58 densitometry 58 carcinoid tumor 58 full thickness plication 58 optical coherence tomography 58 PiB PET 58 lobular carcinoma 58 hamartoma 58 adnexal masses 58 myocardial perfusion imaging 58 lung biopsies 58 silent ischemia 58 VCUG 58 Angiogram 58 Rectal cancer 58 abdominal CT scan 58 Single Photon Emission Computed 58 core needle biopsy 58 Sodickson 58 sonographically 58 perfusion defects 58 nephrectomies 58 Sigmoidoscopy 58 NSTE ACS 58 cardioplegic arrest 58 colon resection 58 intima media thickness 58 SOMATOM Sensation 58 uterine tumors 58 perfusion MRI 58 fibrocystic 58 corneal topography 58 artery stenosis 58 bypass grafting 58 para aortic 58 biliary tree 58 endometrial hyperplasia 58 retroperitoneal 58 LVRS 58 ductal breast cancer 58 intensity modulated radiotherapy 58 transesophageal echocardiogram 58 cholecystectomy 58 glomerular filtration 58 DXA scan 58 bilateral orchiectomy 58 Minimally invasive procedures 58 precancer 58 Mammographic 58 treat menorrhagia 58 GnRH agonists 58 submandibular gland 58 Functional magnetic resonance 58 nuchal translucency 58 RVOT 58 radical retropubic prostatectomy 58 minimally invasive laparoscopic surgery 57 multimodality therapy 57 urolithiasis 57 CT Computed Tomography 57 intensity modulated 57 Amniocentesis 57 pelvic radiotherapy 57 carotid artery thickness 57 transurethral 57 Flexi Scope 57 SPECT PET 57 pulmonary dysfunction 57 undergo prostate biopsy 57 computed tomographic angiography 57 diffusion tensor 57 intraperitoneal chemotherapy 57 precursor lesions 57 perioperative complications 57 transfusion syndrome 57 transvaginal 57 urography 57 sonographic examinations 57 PR interval prolongation 57 saline infusion 57 micrometastasis 57 Multidetector CT 57 immunohistochemical analysis 57 axillary node dissection 57 microdebrider 57 colonic polyps 57 computed tomography PET CT 57 noninvasive painless 57 diffusion MRI 57 HIPEC 57 hyperacute 57 premalignant lesions 57 preoperative MRI 57 Optical coherence tomography 57 benign lesions 57 Breast Specific 57 sentinel node 57 radical prostatectomy RP 57 malignant lesions 57 adnexal mass 57 systolic dysfunction 57 atrial pacing 57 cCTA 57 prophylactic cranial irradiation 57 coronary arterial 57 electrocardiographic 57 liver metastasis 57 noncardiac 57 DCIS lesions 57 liver biopsies 57 Duodenal 57 stereotactic biopsy 57 liver biopsy 57 Stenting 57 histological diagnosis 57 cTnT 57 ductal carcinomas 57 Hurthle cell 57 lung resections 57 cardiac troponin T 57 lumbar disk herniation 57 leiomyoma 57 enucleation 57 adenomatous 57 thrombolytic therapy 57 extracranial 57 serrated polyps 57 Doppler ultrasonography 57 Mitomycin C 57 T1a 57 CINtec ® PLUS 57 thymectomy 57 malignant ovarian 57 RF ablation 57 undergone radical prostatectomy 57 bowel polyps 57 Balloon angioplasty 57 brain perfusion scans 57 atrial ablation 57 Preoperative 57 PD2i R 57 cystectomy 57 Molecular imaging 57 endoscopic surgical procedures 57 SLN biopsy 57 bacterial prostatitis 57 revascularization procedures 57 Fecal occult blood 57 angio 57 ultrasonography 57 precancerous tumors 57 Somatom Definition 57 pCLE 57 malignant nodules 57 mammographically 57 neoplasias 57 endorectal coil 57 computed tomography SPECT 57 percutaneous interventions 57 multidetector computed tomography 57 postoperative infections 57 TLIF 57 adenoidectomy 57 clot dissolving drugs 57 advanced adenoma 57 conditional logistic regression 57 Scheuermann kyphosis 57 intravenous bisphosphonates 57 robotic radical prostatectomy 57 renal arteries 57 coronary revascularization procedures 57 #F FDG PET 57 Coronary artery calcium 57 enhanced sonography 57 MDCT scans 57 clinically insignificant 57 calcified plaques 57 cerebral angiogram 57 fundus camera 57 lobular carcinomas 57 Elastography 57 adolescent idiopathic scoliosis 57 CK MB 57 allogeneic HSCT 57 Carotid artery stenting 57 renal scarring 57 molar pregnancy 57 PET CT scans 57 thermogram 57 paroxysmal AF 57 pretargeting 57 carotid artery stenting 57 mammographic density 57 CT angiograms 57 abnormal EKG 57 incidentalomas 57 micro calcifications 57 Fine needle aspiration 57 LightSpeed VCT 57 node dissection 57 Uterine cancer 57 optical coherence tomography OCT 57 primary percutaneous coronary 57 dissolving clots 57 KRAS mutation 57 angioplasty stenting 57 invasive carcinomas 57 endoscopists 57 testicular cancers 57 thrombus aspiration 57 breast biopsies 57 TURP 57 sonographic appearance 57 MR Angiography 57 Heavy menstrual bleeding 57 coronary stenosis 57 Intensity Modulated 57 renal artery stenosis 57 coronary artery blockages 57 magnetic resonance angiography 57 PET CT scanning 57 nodal dissection 56 adenoma detection 56 intra cytoplasmic sperm 56 urothelial carcinoma 56 median sternotomy 56 myocardial revascularization 56 Fine Needle Aspiration 56 noninvasive technique 56 SUVmax 56 topical anesthesia 56 antiangiogenic therapy 56 gauge vitrectomy 56 functional MRI fMRI 56 cancerous polyps 56 Papillary 56 dosimetric 56 lung resection 56 microvessel 56 functional mitral regurgitation 56 coronary angiograms 56 microdissection 56 Carotid artery 56 R0 resection 56 hyperplastic 56 Electrocardiography 56 hypervascular tumors 56 prophylactic mastectomies 56 cystoscopic 56 HIV HCV coinfected 56 Coronary angioplasty 56 SPECT MPI 56 invasive carcinoma 56 MRIs magnetic resonance 56 total thyroidectomy 56 ventricular myocardium 56 lipid lowering therapy 56 digital subtraction angiography 56 Radiographs 56 angiographies 56 transient elastography 56 Echocardiograms 56 pancreatic resection 56 anastomotic devices 56 sputum cytology 56 HGPIN 56 invasive diagnostic 56 Sentinel Lymph Node 56 PCa 56 ultrasound elastography 56 postoperative hemorrhage 56 postoperative mortality 56 Laparoscopic surgery 56 polypoid 56 Radiation therapy 56 nondiagnostic 56 pulmonary artery banding 56 troponins 56 severe mitral regurgitation 56 Subgroup analysis 56 deCODE BreastCancer 56 carotid intima media 56 SBRT 56 carotid endarterectomy CEA 56 metaplasia 56 conformal radiation 56 Circulating tumor cells 56 hyperintense lesions 56 computed tomography 56 potentially cancerous polyps 56 Venous thromboembolism 56 MRI positron emission 56 endoscopist 56 antigen PSA 56 external beam radiotherapy 56 Radiographic 56 sigmoidoscopy 56 axillary node 56 anthropometric measurements 56 RARP 56 oral anticoagulation 56 mCi 56 osteoporotic compression fractures 56 DEXA 56 kidney cysts 56 Skin sterol 56 noninvasive imaging 56 beta blocker therapy 56 ICD implantation 56 Sentinel Lymph Node Biopsy 56 partial nephrectomy 56 undergoing colonoscopy 56 laparoscopically assisted 56 contrast barium enema 56 breast asymmetry 56 fibrocystic disease 56 TOF PET 56 invasive lobular 56 intestinal metaplasia 56 Carotid Revascularization Endarterectomy vs. 56 microcalcifications 56 Screening Trial 56 liver resection 56 peritoneal cancer 56 Computed Tomography 56 interventional radiology procedures 56 acetabular fracture 56 thyroid nodule 56 sternotomy 56 TEVAR 56 node metastases 56 T2 weighted 56 mediastinal lymph nodes 56 undergoing coronary artery 56 endoscopically 56 TRUS 56 elevated CRP 56 Screening mammography 56 NMP# assay 56 IOL implantation 56 gastrectomy 56 PET positron emission tomography 56 MRgFUS 56 Thrombolysis 56 electrocardiogram EKG 56 pCR 56 tumor excision 56 nonobstructive CAD 56 metastatic androgen independent 56 TACE 56 precancerous polyp 56 PAP smears 56 coronary artery calcium 56 penetrating keratoplasty 56 lymph node metastases 56 incomplete revascularization 56 pelvic examinations 56 DCE MRI 56 nonmetastatic prostate cancer 56 radiofrequency ablation RFA 56 aberrometer 56 adenoma 56 noninvasive outpatient 56 T1 weighted 56 CT Colonography 56 ductal cancer 56 stereotactic body 56 Hypertrophy 56 central corneal thickness 56 CT fluoroscopy 56 CIN3 56 FDG uptake 56 deep vein thromboses 56 lymph node biopsies 56 paraganglioma 56 Intraoperative 56 MR arthrography 56 bronchoscopies 56 Minimally invasive surgery 56 colorectal polyp 56 vaginal hysterectomy 56 PCA3 scores 56 intravascular ultrasound 56 PET CT colonography 56 degenerative spondylolisthesis 56 malperfusion 56 DEXA dual 56 iterative reconstruction 56 stable angina 56 Toshiba Aquilion ONE 56 dysplastic nevi 56 epicardial 56 bone bruise Bettis 56 osteoid osteoma 56 Coronary Artery Bypass Graft 56 sacrocolpopexy 56 RALP 56 operable breast cancer 56 calcified plaque 56 x rays MRIs 56 contrast echocardiography 56 Angiography 56 Scintigraphy 56 tonsil removal 56 Coronary artery bypass grafting 56 epidural analgesia 56 abnormal uterine bleeding 56 helical TomoTherapy 56 diffusion weighted 56 Carotid stenting 56 sonographic 56 colonoscopy flexible sigmoidoscopy 56 SOMATOM Definition Flash 56 occult metastases 56 coronary catheterization 56 radiographic imaging 56 Ultrasonographic 56 hyperinsulinemic euglycemic clamp 56 Subgroup analyzes 56 pacemaker implantation 56 dose ionizing radiation 56 Echocardiographic 56 artery blockages 56 Ectopic pregnancy 56 ProstaScint 56 osteoid 56 androgen suppression therapy 56 pulsed Doppler 56 HI VISION 56 primary hyperparathyroidism 56 postoperative AF 56 myomas 56 Third Eye Retroscope 56 CIN2 + 56 ALA PDT 56 gastroscopy 56 abdominal aneurysms 56 repair TEVAR 56 histopathological examination 56 colorectal adenoma 56 varices 56 stent graft placement 56 CT computerized tomography 56 retransplantation 56 mammographic screening 56 coblation 56 thyroidectomy 56 recurrent glioblastoma multiforme 56 Histologic 56 risk reducing salpingo 56 cervical cytology 56 Hormonal therapy 56 #D/#D imaging 56 benign uterine 56 attenuation correction 56 RAS mutations 56 neoadjuvant chemotherapy 56 #.#T MRI 56 ablative therapy 55 cervical carcinoma 55 Fibroid tumors 55 noninvasive ultrasound 55 Multiple logistic regression 55 ultrasound computed tomography 55 spontaneous regression 55 focal cryoablation 55 pre cancerous growths 55 androgen deprivation 55 nonfasting triglyceride levels 55 preoperative diagnosis 55 Aquilion 55 T2 lesions 55 barium enema 55 occlusive disease 55 Vizilite 55 Lumpectomy 55 detect precancerous 55 Intensity Modulated Radiation Therapy 55 clot dissolving drug 55 cardiac troponin 55 urinary cytology 55 single photon emission 55 pneumonectomy 55 Ultrasound imaging 55 denervation 55 Stereotactic Body Radiation Therapy 55 coronary endothelial 55 postsurgical 55 noncalcified 55 PSADT 55 revascularisation 55 perforated appendicitis 55 Surgical resection 55 mediastinum 55 scintigraphic 55 Cardiolite ® 55 prostate bladder 55 TAVR 55 mammography ultrasound 55 multiplanar reconstruction 55 Fluoroscopy 55 Plain radiographs 55 tomosynthesis 55 prophylactic mastectomy 55 ejection fractions 55 sleeve lobectomy 55 osteopenic 55 HER2 positive tumors 55 histological subtype 55 ventricular tachyarrhythmias 55 percutaneous intervention 55 karyotyping 55 pancreatic cysts 55 benign polyps 55 locoregional recurrence 55 immunohistochemical 55 endobronchial 55 Ebstein anomaly 55 hepatic resection 55 gadobutrol 55 Contrast Enhanced 55 underwent angiography 55 curable cancers 55 Coronary CT angiography 55 balloon brachytherapy 55 SPECT imaging 55 sympathectomy 55 Automated Breast Ultrasound 55 relapsed MM 55 percutaneous drainage 55 dimensional ultrasonography 55 galiximab 55 malignant lesion 55 nerve sparing 55 urethral stricture 55 tracheal intubation 55 testosterone supplementation 55 immunochemical 55 prostate cancer metastases 55 pancreatic adenocarcinoma 55 Transesophageal 55 colonscopy 55 recurrent ovarian 55 atypical lobular hyperplasia 55 ASIR 55 ImmuKnow assay 55 PAP smear 55 Uterine fibroid embolization 55 DynaCT 55 MTWA testing 55 Postoperatively 55 bladder tumors 55 Colon polyps 55 cecal intubation 55 Positron emission 55 noncancerous prostate 55 allogeneic transplants 55 axilla 55 postoperative radiographs 55 lipid lowering drugs 55 extracapsular extension 55 UPPP 55 undergoing CABG 55 anticoagulated 55 Virtual colonoscopies 55 Adenomas 55 cranial irradiation 55 histologic examination 55 Squamous Cell Carcinoma 55 prostate cancer PCa 55 Artis zeego 55 resections 55 epithelial ovarian cancer 55 breast endometrial 55 Ejection Fraction 55 scintigraphy 55 LHRH receptor positive 55 transarterial 55 immunohistochemical staining 55 Positron Emission Tomography 55 Breast MRIs 55 florbetaben 55 blocked carotid arteries 55 imaging MRI 55 fetal echocardiography 55 pathologic correlation 55 adenomatous polyp 55 multidetector computed tomography MDCT 55 BRCA mutation carriers 55 Mitral valve repair 55 logistic regression analyzes 55 carotid plaque 55 lateral radiographs 55 fluoroscopy 55 cryptogenic stroke 55 pathologic diagnosis 55 European Randomized Study 55 tissue perfusion 55 basilar 55 post thrombotic syndrome 55 Varian linear accelerators 55 ischemic cardiomyopathy 55 intracranial atherosclerosis