ARRT Magnetic Resonance Imaging (MRI) Registry Practice Test

These questions are part of the practice quiz. Start practicing

• What would the scan time be in a 3D volume acquisition with TR 24 ms, TE 7 ms, Flip Angle 15°, FOV 20cm, 2mm slice thickness, 76 slices, 176 x 256 matrix, 1 NEX?
• Which of the following best describes the concept of "spatial resolution" in MRI?
• What technique is utilized when a gradient echo sequence is selected for fast, breath hold dynamic contrast-enhanced imaging of the abdomen?
• Which sequence uses T1 gradient echoes and suppresses signal from stationary tissues?
• In a Fast Spin Echo sequence, the number of shots is calculated by:
• If a patient has a heart rate of 70 beats per minute, what is the effective TR?
• According to MRI safety standards, "Level 1" personnel are defined as:
• All of the following are examples of INTRINSIC contrast parameters in tissues EXCEPT:
• The HEIGHT of a peak on an MR spectrum correlates to the _________ of a substance that was detected.
• Which of the following choices represents a disadvantage of increased RF pulse bandwidth?
• What is the main purpose of shimming the magnet in MRI?
• In a Fast Spin Echo (FSE) sequence, how can blurring be reduced when T1 or PD weighted images are acquired?
• In a fast spin echo sequence with a given set of parameters, what is the calculated scan time?
• Which of these is a purpose of increasing the NEX in MRI scanning?
• What is the name of the valve located between the left atrium and the left ventricle?
• What is a common factor that impacts the quality of MRI images?
• The common carotid artery bifurcates into internal and external carotid arteries at which spinal level?
• If the flip angle is doubled, how much does RF deposition increase by?
• Which type of fields is documented to cause muscle contractions and visual light flashes?
• Which type of blood cell is responsible for phagocytosis?
• Diseases like malaria that are transmitted via insects are classified as what type of infections?
• Which combination of flip angle and TR produces a T2 weighted gradient echo?
• What role does the echo time (TE) play in MRI imaging?
• When transferring patients, where should a urinary collection bag be placed?
• Which imaging technique uses a very rapid pulse sequence during patient rest or activity?
• The first major branch of the abdominal aorta is the?
• Shimming in MRI can be performed by all the following EXCEPT:
• What is the term for the phenomenon that results in the increase in signal-to-noise ratio with increasing magnetic field strength?
• All of the following artifacts except ________ occur along the phase encoding axis.
• How does fat behave in terms of T1 and T2 relaxation times?
• Reducing echo time (TE) results in what sort of change to image contrast?
• What percentage of patients reportedly have allergic reactions to gadolinium contrast agents?
• The final result in a spectroscopy study is:
• If the third ventricle is dilated, but the fourth ventricle is not, what pathology would be associated with?
• The inversion time (TI) selected to null the signal from a specific tissue should be what percentage of the T1 relaxation time of that tissue?
• What type of isolation precautions should be used for HIV-positive patients in the MRI suite?
• To increase the voxel volume, which parameters would be adjusted?
• What is the primary purpose of a spoiler gradient pulse in MRI?
• The medial and lateral rectus muscles can be found in which part of the body?
• T2 weighted FLAIR sequences are typically used for the evaluation of which condition?
• Which MRI system component is responsible for producing the B1 magnetic field?
• Calculate the pixel area for the following sequence: TR 4000, TE 120, FOV 36cm, 408 x 512 matrix, 2 NEX, ETL 12.
• Which MRI sequence is best for visualizing edema?
• Which sequence is best described as a 180° pulse followed by a 90°/180° combination?
• Which factor does NOT influence the characteristics of gradient echo sequences?
• How do chemical fat suppression techniques operate?
• What is a common cause of droplet contamination in an MRI environment?
• A magnetic vector is characterized by which two attributes?
• What happens to SNR when increasing the flip angle in MRI up to the Ernst angle?
• According to the 2003 FDA revision, what is the RF absorption limit for the head?
• Which of the following sequences is the most insensitive to magnetic field inhomogeneity?
• What effect does reducing the Phase Matrix have on SNR in an image?
• Which field strength would require the shortest TI time to suppress the signal from fat in a STIR sequence?
• What does the term "B0" refer to in MRI imaging?
• Which imaging plane is optimal for evaluating Arnold Chiari Malformation?
• What is the most common rate of oxygen administration in an emergency situation?
• What will occur when reducing the FOV (field of view) only?
• Which four muscles and tendons are part of the rotator cuff in the shoulder?
• Which MRI sequence is most commonly recommended for evaluating white matter disease?
• What does the gradient slew rate refer to?
• In phase contrast MRA, the signal intensity within the vessel is dependent on what factor?
• CSF suppression in MRI is performed with which type of technique?
• What is the optimal imaging plane to visualize a TFCC tear?
• What effect would using a steep slice select slope and/or narrow bandwidth have on slice thickness?
• Individuals identified as "Level 2" personnel include:
• As the TE is increased:
• When imaging the female pelvis, which view is the most optimal for evaluation of the uterus?
• What is the smallest object that can be resolved in an image acquired with a 24cm FOV and a 272 x 272 matrix?
• For magnetic resonance angiography, which type of sequence utilizes velocity-induced phase shifts for vascular signal?
• To produce a high quality reformatted image, the:
• Active shielding can be defined as:
• All of the following comprise the biliary tree EXCEPT?
• The slice thickness in MRI can significantly affect which of the following?
• When performing MRI, what term describes the time taken for protons to realign with the magnetic field after being disturbed?
• Hemangiomas in the liver are best visualized with which type of imaging?
• Which MRI sequence is particularly useful in identifying hemorrhage or acute traumatic lesions?
• Which sequence is typically used for imaging brain tumors due to its high sensitivity to water content?
• Which factor should be decreased to improve signal-to-noise ratio in MRI imaging?
• If a patient weighs 176 lbs, what is the dosage of contrast (0.1mmol/kg) that should be administered?
• Which MRI contrast agent is commonly used due to its paramagnetic properties?
• Which of the following best describes a FSE sequence?
• The unit of measurement of the magnetic field surrounding the periphery of the MR scanner is expressed as:
• What is the result of reducing the number of lines filled in k-space?
• What is the typical effect of using parallel imaging in MR imaging?
• What ethical principle is implied by the statement "the goal is to do no harm" in healthcare practice?
• In a superconducting magnet, the magnetic field strength is increased by increasing the:
• To generate thin slices, which equipment is required?
• The _________ is defined as the resonant frequency, and is equal to the product of the magnetic field and the gyromagnetic ratio.
• The energy used to form MRI images is ____________ the patient's tissues.
• Which imaging characteristic is maximized with increased TR?
• In magnetic resonance imaging, what is the purpose of a STIR sequence?
• What type of sequences relies on flow-related enhancement to visualize flowing blood?
• In a gradient echo sequence, which option does NOT help yield high signal from fluid?
• Water has a __________ T1 relaxation time and a ________ T2 relaxation time.
• What is the role of a steep slice selection gradient?
• Which of the following adjustments will shorten scan time in an MR pulse sequence?
• The gradient rise time is defined as?
• A narrow receiver bandwidth causes which of the following effects?
• What type of flow does single order gradient moment nulling not compensate for?
• What term describes the process where only half of the views of k-space are filled in the frequency axis?
• What technique is used to create additional images in various planes from a 3D data set?
• Which of the following best describes an EPI sequence?
• The process that digitizes the MR signals is known as:
• When is the optimal time to administer gadolinium-based contrast for enhancing MRI visibility?
• The source of infection where pathogens thrive in numbers sufficient to cause a threat is known as a:
• Which of the following parameters affects the contrast in a T1-weighted MRI image?
• What is the primary purpose of using T1 weighted images in MRI for brain evaluations?
• A technique utilized to reduce the MRI scan time which requires the use of an array coil is:
• In MRI, what does the term "echo time" (TE) refer to?
• Magnetic field inhomogeneity is expressed in:
• Reducing the field of view (FOV) by a factor of 2 will reduce the voxel volume by which factor?
• What is the significance of using gadolinium in MRI?
• What effect does increasing the number of phase encodings have on image resolution?
• Which MRI system component is primarily responsible for magnetizing proton spins?
• What pixel size results from a 3D acquisition using a 260mm FOV and a 320 x 320 matrix?
• What is one of the main benefits of using a larger matrix in MRI?
• Short TAU inversion recovery (STIR) sequences are utilized for evaluating all except which of the following?
• Which fissure divides the frontal and parietal lobes from the temporal lobes?
• During which process is the readout gradient typically turned on along with the sampling or readout of the peak echo?
• Which element is primarily utilized in clinical MR imaging?
• What anatomical structure is predominantly visualized with T1-weighted images in MRI?
• The extent to which a material or tissue becomes magnetized in an external magnetic field is called?
• All of the following would aid in reducing scan time EXCEPT:
• The Ernst angle can be defined as the optimal ___________ that yields the ____________ signal for a particular spin in the least amount of time.
• In an MRA sequence, how is signal removed from vessels?
• Magnetic susceptibility artifacts are most prominent with which type of sequences?
• Which of the following is NOT a type of fomite found in an MRI environment?
• What effect does reducing the TE have on image contrast?
• When parallel imaging techniques are utilized, a low resolution __________ is acquired prior to the acquisition.
• In a dual contrast spin echo sequence, what characteristic does the second echo image have compared to the first echo image?
• What parameter is primarily adjusted to control the amount of noise in MRI images?
• Choose the correct slice thickness to create an isotropic voxel for the following: TR 2000, TE 90, Matrix 272 x 272, FOV 24cm.
• Which parameter combination will yield the best spatial resolution?
• Reducing the flip angle yields images with what change in image contrast?
• Which parameter adjustments will LENGTHEN scan time in an MR pulse sequence?
• If the TR in a gradient echo sequence is less than the T2 (or T2*), what is the resulting condition called?
• In order to acquire an intracranial arterial blood flow sequence, a presaturation pulse would be applied in which location?
• In MRI, the phase encoding gradient is critical in determining:
• Which of the following does NOT yield a higher signal-to-noise ratio?
• As the TR is increased, which outcomes are expected?
• A gradient echo sequence in which all the remaining residual transverse magnetization is removed prior to the next excitation pulse is known as:
• What is the approximate difference in chemical shift measured in parts-per-million?
• Contrast in Diffusion Weighted Imaging (DWI) depends on:
• If a 192 phase resolution is required, how many times must the TR be repeated for 1 NEX?
• A remedy for a Gibbs truncation artifact would be?
• In MRI, which view is considered most optimal for the evaluation of the ovaries in the female pelvis?
• Which of the following adjustments helps to improve SNR in an MR image?
• Which adjustments reduce the overall signal-to-noise ratio (SNR) in an MR image?
• In which orientation can a tear of the collateral ligaments of the knee be best visualized?
• On T1 weighted images of the spine, how does cerebrospinal fluid (CSF) appear in relation to the spinal cord?
• Calculate the voxel volume for the following pulse sequence: TR 2000, TE 85, FOV 24cm, Matrix 272 x 320, 3mm slice thickness, 3 NSA.
• What happens to the signal-to-noise ratio (SNR) when the number of phase encodings is increased from 256 to 512?
• In a cross sectional view of the MR magnet design, which coils are closest to the patient?
• What step is performed prior to frequency encoding in MRI?
• During dynamic enhanced imaging for vasculature or visceral structures, contrast is administered and k-space is filled with __________ to ensure that the contrast enhancement is well visualized.
• Which anatomical structure is NOT part of the shoulder rotator cuff?
• The __________________ runs the length of the falx cerebri.
• What is a major advantage of using a 2D time of flight sequence in MRI?
• The MRI system component that provides the ability to perform spatial encoding is the:
• When performing MRI to rule out brain tumors, which weighted images are typically acquired to evaluate lesion involvement after the injection of gadolinium?
• When imaging a hemorrhagic infarct in the brain, which pulse sequence would demonstrate the magnetic susceptibility effects better?
• In the TMJ's, the articular disc lies between what two anatomical structures?
• A disadvantage of TOF MRA is high signal in some background tissues. To minimize signal from background tissues, TE should be selected that enables the signals from fat and water to be:
• Collecting the low frequency (high amplitude signal) data points in k-space at the start of the scan is known as?
• What is a potential downside of reducing the slice thickness in MRI?
• Which of the following is NOT affected by changing the slice thickness?
• For T1 weighted images, why is contrast enhancement used to rule out metastatic lesions of the spinal cord?
• The ligamentum flavum can be found in which part of the body?
• Which imaging technique is most commonly used to differentiate between various soft tissues in the brain?
• Which imaging modality is known to provide the best detail for soft tissue resolution in the abdomen?
• An adverse reaction or complication caused by treatment from a healthcare professional is called:
• On a T2 weighted image, edema appears bright because it has a _________ relaxation time.
• In a contrast enhanced MR angiography of the abdominal arteries, the IV gadolinium would enhance in which order?
• Dynamic enhanced MRA sequences of the mesenteric arteries are performed using:
• In a Fast Spin Echo (FSE) sequence with a long TE yielding T2 weighted images, how can scan time be reduced?
• What protocol would be selected to rule out islet cell tumor?
• What does the final result of a perfusion study indicate?
• What is the main characteristic of inversion recovery imaging in MRI?
• To accurately produce an image based on differences in T1, the time interval between 90° excitation pulses should be:
• In a medical malpractice lawsuit, who has the burden of proof for medical malpractice?
• When imaging a geriatric patient, which imaging parameter is typically adjusted in a PCA MRA sequence?
• What happens to SNR when TR is increased?
• The receiver bandwidth (rBW) affects:
• What type of surface coils are used with permanent magnets that have a vertical magnetic field?
• The primary safety concern when operating an MRI system is:
• Which material could be used to line the walls and/or floors of the MR magnet room to reduce the fringe field, and is defined as __________ shielding?
• For a patient with a heart rate of 90 beats/min and a trigger window of 15%, what is the available imaging time if the trigger delay is 80ms?
• In MRI, what does T1 relaxation primarily correlate with?
• Another term used for "fever" is:
• RF energy used in MRI is classified as what type of radiation?