Ultrasonic waves, in nature, are:
mechanical waves
radar waves
microwaves
radio waves
Correct Answer :
A. mechanical waves
radar and microwaves are electromagnetic waves.
Related Questions
By ultrasonography, when kidneys appear darker than the liver, they are:
hypoechoic
hyperechoic
anechoic
isoechoic
Which statement is true concerning renal ultrasonography?
end-stage renal failure kidneys look small and hypoechoic
it is more accurate on diagnosing cystic lesions than solid masses
it is able to detect tumors as small as 2 mm
cortical carbuncle might be mistaken for hydronephrosis
What is true concerning Tc-99m DTPA?
Its uptake by glomerular filtration is almost 100%
It helps evaluate cortical structure and morphology
It provides a static picture of kidneys when compared to MAG3
it binds to the sulfhydryl groups in proximal tubules resulting in much higher resolution pinhole SPECT imaging
Which condition tops the differential diagnoses list of CT picture of Xanthogranulomatous pyelonephritis?
renal tuberculosis
renal abscess
renal cell carcinoma
angiomyolipoma
What is correct concerning sound waves?
The higher the frequency, the deeper tissue penetration
The higher the frequency, the better the axial resolution
low-frequency transducers are of 6 to 10 MHz
the deeper tissue penetration, the better axial resolution
What is false on comparing Tc-99m DTPA to Tc-99m MAG3?
DTPA provides better quality images with renal insufficiency
by giving captopril, MAG3 plasma clearance declines in hypertensive patients with renal artery stenosis but rises in those who do not have the disease
DTPA provides an excellent measurement of GFR
in pediatrics, MAG3 provides better quality images than DTPA
How does a full bladder appear on ultrasonography?
hyperechoic
hypoechoic
isoechoic
anechoic
Using CT scanning, which solid kidney mass is sharply demarcated with uniform enhancement and often has a central scar?
RCC
metastases
angiomyolipoma
oncocytoma
What nuclear medicine study can diagnose interstitial nephritis?
DTPA
DMSA
gallium-67
MAG-3
Which of the following is NOT an indication of static cystography?
evaluating a probable bladder rupture
evaluating a probable colovesical or vesicovaginal fistulae
evaluating a probable intravesical pathology
evaluating a probable bladder diverticula
Which condition does NOT show a false negative result for hydronephrosis on ultrasonic examination?
forniceal rupture
drained renal pelvis
high urine output
acute obstruction
Using ultrasonography, which testicular lesion is described as a solid, round, homogeneous, low-reflectivity tumor mass, with no calcification?
seminoma
embryonal cell tumor
mixed germ cell tumor
epidermoid cyst
What imaging modality is superior in detecting undescended testis in the abdomen?
MRI
CT
ultrasound
all are comparable
How does fluid appear on T2-weighted MR images?
dark
intermediate
bright
none of the above
What is the emergency treatment of intravenous contrast allergy?
epinephrine
atropine
hydrocortisone
antihistamine
Which radiological modality carries the highest radiation hazard?
nuclear medicine
ultrasonography
X-ray fluoroscopy
intravenous urography
What is the signal characteristic of renal stones on MRU?
high signal on T1-weighted images
high signal on T2-weighted images
low signal on T1-weighted images
none of the above
Which condition could present as a filling defect in the bladder on IVU study?
blood clot
fibro-epithelial polyp
sloughed renal papilla
all of the above
Which ultrasound mode is able to depict motion direction and flow velocity?
grey-scale
simultaneous bilateral views
color Doppler
power Doppler
Which statement concerning phlebolith is false?
can be mistaken for a ureteral stone
is a small single, usually spiky, calcification within a vein
the amount of phleboliths increases with age
appears more often on the left than on the right side of the pelvis
What should type II diabetic patients on metformin do when going for intravenous contrast urography to avoid biguanide lactic acidosis?
take urine acidifiers
withhold metformin the day before the study and restart 48 hrs. later
get premedicated by steroids and antihistamines
decrease metformin dose and turn to insulin
Which statement is false concerning complications of left renal artery embolization?
embolizing the non-target artery might occur
severe pain at the renal area could occur
complications depend on the embolic agent
reactive left pulmonary edema
Which structure can NOT be assessed by TRUS of the prostate?
ejaculatory duct
vas deferens
seminal vesicles
rectal wall
Ultrasonic 3.5 MHz curved array probe is suitable to detect:
epididymal cysts
testicular tumors
renal stones
penile vasculature
Regarding acute renal infections, what is the least diagnostic radionuclide study for detecting an inflammatory focus?
hippuran I-131
technetium-99m
gallium-67
indium-111labelled WBC
On staging left kidney RCC using enhanced CT, the radiologist must look for:
extension of the tumor to the diaphragm
extension of the tumor to the right atrium
the density of calcifications
the amount and bilaterality of cysts formation
What is false concerning Tc-99m DMSA?
diseases affecting the proximal convoluted tubules inhibit DMSA uptake
it is ideal to assess UPJ obstruction in adults
gentamicin and cisplatin inhibit the DMSA uptake
it allows better assessment of differential renal function
What is the poorest method of measuring the amount of urine in the bladder of a 65 yrs. old man?
using bladder scanner
measuring the voided urine
using abdominal ultrasonography
performing urinary catheterization
Which condition does NOT show a false positive result for hydronephrosis on ultrasonic examination?
hydrocalicosis
extrarenal pelvis
parapelvic cyst
class 2 Bosniak renal cyst
Which statement is false concerning plain KUB film?
reliable tool to exclude urinary calculi
calcifications at renal area might lead to the discovery of renal cancers
can detect soft tissues
fecoliths and phleboliths could be mistaken for calculi