Dr. Guido Davidzon
Nuclear Medicine
Stanford, CA
20 years experience male
Locations
Stanford University
Stanford, CA
My office hours
Thursday: 8:00am - 5:00pm
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Practice website
Insurances accepted
Aetna
Aetna Life Insurance Company
Blue Cross of California
About
Bio
Physician specialized in Biomedical Informatics, Nuclear Medicine and Molecular Imaging at Stanford University.
Areas of interest: Diagnostic and Therapeutic Nuclear Medicine, Nuclear Cardiology and Nuclear Oncology, Clinical and imaging informatics, Medical artificial intelligence, The opinions expressed in this website are solely my own, and not necessarily the opinions of Stanford.
SpecialtiesDoctors may have more than one area of specialty interest. Board certification in a specialty area means the doctor has completed formal training and has practice experience in that specialty, and has passed the certification examination from the corresponding accredited medical specialty board.
Doctors may have more than one area of specialty interest. Board certification in a specialty area means the doctor has completed formal training and has practice experience in that specialty, and has passed the certification examination from the corresponding accredited medical specialty board.
Nuclear Medicine
Healthcare Professional
Licenses
United States: California
Doctor Q&A
73 Answers
55 Agrees
The number of answers this doctor has agreed with.
A 41-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Abnormal: Normal ejection fractions are usually greater than 50% and generally, an ejection fraction of less than 35% is considered abnormal. A reduced ejection... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 34-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Approved for cancer: Pet scan are approved for staging, response assessment and surveillance of certain types of cancers. However, any pathologic process that augments the... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 26-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Renal is difficult: There is great variability of FDG uptake by renal cell cancers. The most significant issue is the large amount of urinary excretion of 18f-fdg, which ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 26-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Sensitivity: Current literature estimates the sensitivity of f18-fdg for nodal metastatic renal cancer to be about 75% and declines to 50% after chemotherapy.
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Thyroid uptake/scan: Thyroid uptake and scan alone can differentiate grave's disease from other thyrotoxicosis. The study has two portions, the uptake measures the percent... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.6k viewsReviewed >2 years ago
A 71-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Yes: With current pet systems, the limit of resolution for detecting typical cancers by 18f-fdg pet generally ranges between a 0.4- and 1.0-cm diameter, wh... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsAnswered >2 years ago
A 32-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Maybe: Pet/ct scan is a very sensitive test and may very well find additional sites of disease. However, its sensitivity varies depending on the cancer histo... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsReviewed >2 years ago
A 61-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
No: The thyroid scan, if referred to the nuclear scan, is a diagnostic study done with three possible isotopes: i-123, i-131 (low-dose) or free tc-99m. Th... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsReviewed >2 years ago
A 28-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
3D Functional Image: Three-dimensional image of functional processes in the body. The scan is acquired after the administration of a radiotracer. Most commonly done with ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsReviewed >2 years ago
A 67-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Eyes to thighs: Even though the study is called whole body pet/ct, most often the image acquisition is from the eyes to thighs. The parts of the body that are include... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsReviewed >2 years ago
A 56-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Yes: Fasting for more than 24 hours without the appropriate preparation before hida or the use of opioids (morphine, etc.) could fail to show feeling of th... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.3k viewsReviewed >2 years ago
A 40-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Get a pregnancy test: If in doubt, the safest thing will be to get a pregnancy test before any testing that involves radiation. This is true for nuclear medicine or radiolo... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 52-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Varies: The accuracy of the test is variable depending on which pathologic process you are evaluating in the brain (epilepsy, dementia, differentiating a recu... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 32-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Metabolism & Anatomy: A pet scan is use to evaluate metabolic processes in your body. Currently pet scans are most commonly use to evaluate the glucose metabolism to assess... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 39-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
No: Size matters: with current pet systems, the limit of resolution for detecting typical cancers by 18f-fdg pet generally ranges between a 0.4- and 1.0-c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
4.9k viewsAnswered >2 years ago
A 55-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Lung background: I think that you are asking what is the lowest suv value that a lung nodule could have? Or when is a lung nodule suspicious? We usually use the lung b... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsReviewed >2 years ago
A 47-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
2 weeks: A low-iodine diet should usually be followed for 2 weeks prior to a thyroid whole-body scan. The rationale behind this is to reduce the chances of non... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 29-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Yes: A capsule of i-123 is taken usually 24 hours prior to a thyroid uptake and scan. To achieve reliable test results make sure you have not had a contras... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
PET is not 100%: The distribution and intensity of hyper-metabolic activity appearance on a pet/ct scan could be abnormal and may represent malignancy but is not patho... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 43-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Billiary tree: From your question it seems that you had a hida scan that showed radiotracer in the gallbladder but no excretion into the bowel was seen. No radiotrac... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsReviewed >2 years ago
A 50-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Surgery and I-131: Your questions is very broad as treatment usually varies depending on subtype of thyroid cancer and staging.Generally speaking the treatment of thyroi... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 52-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Different tests: You had a thyroid ultrasound which evaluates the anatomy of your thyroid gland. To find out if a thyroid nodule is hot or cold you need a nuclear thyr... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.6k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Yes: There are no radiation safety measurements or precautions to follow after you have a nuclear cardiac stress test using tc99m, thallium, or other diag... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 47-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Size and intensity: There are few reasons why you may not see known nodules in a i-123 thyroid scan. First, size is important as usually cameras cannot resolve small nodu... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 67-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
BS Not specific: Bone scans are very sensitive but not specific studies. Images show activity related to bone formation in response to an insult rather than the insult... Read More
Created for people with ongoing healthcare needs but benefits everyone.
4.9k viewsReviewed >2 years ago
A 26-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Variable: The exact radiation you get from ct and pet/cts varies based on the used protocol. Roughly speaking a diagnostic ct gives you a rad dose of 10-15 msv.... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 35-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Tc-99m-MDP Bone Scan: Bone scan often provides an earlier diagnosis and demonstrates more lesions than are found by radiographic procedures.Tc-99m-mdp (methylene diphosphon... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 47-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
4 weeks: The objective is to get you into a hypothyroid state where your endogenous thyroid stimulating hormone (TSH) will be the highest resulting in higher c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsReviewed >2 years ago
A 43-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Few different things: Pet is most helpful to evaluate heart perfusion, where the adequacy of blood flow to the myocardium in conjunction with exercise or pharmacologic stre... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsReviewed >2 years ago
A 42-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Short half-life: F18-FDG is excreted in your urine and it decays pretty rapidly with a half-life of 110 minutes. I don't know of studies that investigated its con... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.6k viewsReviewed >2 years ago
A female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Absolutely: You can find some of the sucessful clinical applications of nuclear medicine on this article follow this link:
http://www.Intechopen.Com/books/medi... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.3k viewsReviewed >2 years ago
A 24-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
PET procedure: For oncologic purpose, patients should be fasting for 5-12 hours. A radioisotope tracer analogo to glucose is injected IV. Approximately 60 min later ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 35-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Several things: An f18-fdg pet scan will highlight cells in your body that are consuming glucose at a different rate (usually higher) than its surrounding tissues. ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Tracer uptake: Standardized uptake value is the measured activity normalized for body weight/surface area and injected dose. In an fdg-pet scan tissues that have hig... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.5k viewsAnswered >2 years ago
A 22-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Adverse reactions: Adveres reactions encountered during clinical trials (n=496) include: headache (1.8%),
musculoskeletal pain (0.8%), fatigue (0.6%), nausea (0.6%), a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsReviewed >2 years ago
A 51-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Extremely common: Hepatic, billiary and splenic scintigraphy have had an important role in radionuclide imaging since the 1960s. Hida scan or cholescintigraphy is used ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
4.9k viewsReviewed >2 years ago
A 36-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Not as good: Stress ekg is a very sensitive test and may show signs of stress induced ischemia, such as st depressions. However, it has low specificity, therefore ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
4.9k viewsReviewed >2 years ago
A 37-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Several things: The result of a thyroid uptake test could be abnormally increased or decreased. In the usa, the normal thyroid uptake range is approximately 10-30% at... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 44-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Not for hyperthyroid: The preparation for thyroid uptake and scans for hyperthyroidism varies among practices. I don't ask my patients to go through a low-iodine diet if th... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 42-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Thyroid function: Thyroid uptake and scan is a functional imaging study use to evaluate the functional status of your thyroid gland based on iodine uptake and distribut... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Pain w Sincalide: Common side effect of sincalide is that it stimulates intestinal motility which can cause cramping abdominal pain if infused too rapidly. Symptoms are... Read More
Created for people with ongoing healthcare needs but benefits everyone.
4.9k viewsReviewed >2 years ago
A 34-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
No: You shouldn't feel pain if cck is administer over 60 minutes. The objective measurement of your gallbladder function is the ejection fraction (ef). Th... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.3k viewsAnswered >2 years ago
A 55-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
HIDA scan with EF: After initial feeling with a radiotracer, your gallbladder contraction was stimulated and the percentage of radiolabeled bile ejected from the gallbla... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.6k viewsReviewed >2 years ago
A 52-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Varies: A thyroid uptake and scan may be done with different isotopes and protocols resulting in scan time variation. Typically is done with i-123; you take t... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.6k viewsReviewed >2 years ago
A 48-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Yes and no: Areas with cancer are usually hypermetabolic in a pet scan due to the increased uptake of the radioactive glucose by cancerous cells. Looking at an FD... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Tricky: Not all cancers are hypermetabolic on pet scans and not all hypermetabolic activity in a pet scan is cancer. Inflammation/infection can also show hype... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 35-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Just a test: A thyroid uptake and scan is used to aid the differential diagnosis of newly diagnosed thyrotoxicosis and ideally should use i-123 as the radiopharmac... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 46-year-old member asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
No iodinated salt: The thyroid uptake and scan measures the ability of your thyroid gland to accumulate a radioactive form of iodine (usually i-123). Table salt or seafo... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.7k viewsReviewed >2 years ago
A 32-year-old male asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Tc-99m bone scan: Or tc-99m bone scintigraphy.
Tc stands for technetium.
http://discovermi.org is another good resource sponsored by the snmmi.
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsAnswered >2 years ago
A 31-year-old female asked:
Dr. Guido Davidzonanswered
Nuclear Medicine 20 years experience
Normal: I assume that you are referring to your gallbladder (gb) ejection fraction (ef) . This is calculated after the gb is filled with radio tracer and afte... Read More
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsReviewed >2 years ago
TestimonialsRecommendations and Thank you notes are endorsements given from patients or other doctors.
Recommendations and Thank you notes are endorsements given from patients or other doctors.
2
Recommendations
193
Thank you notes
HealthTap member
Mar 30, 2015
Dr. Davidzon is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
Mar 31, 2015
Dr. Davidzon is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
My daughter's Neurologist will not do a PET scan for her Epilepsy. She is a college Fresh. They give no answers only meds. We are frustrat
HealthTap member
Thank you, the information has been helpfull. They have diagnosed the primary by the pathology as biliary tract. We are staying hopefull.
HealthTap member
Thank you, your answer was very helpful! Exceptionally good answer,thank you for taking the time to answer
Education & Training
Medical/Graduate school
Maimonides University Faculty of Medicine, Argentina
Graduated 2003MD
Residency
Stanford University Medical Center
Awards
Best Essay Travel Grant Award 2012 Mid-Winter SNM/ACNM Annual Meeting January 2012 Stanford University Medical Center Research titled:
Young Investigator Award Symposium SNM, Nuclear Oncology Council June 2011 Stanford University Medical Center
Top Nuclear Medicine Specialist, Third Place, National - Summer
2013
Affiliations
Stanford health care
Stanford hospital
Stanford Hospital and Clinics
Publications
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