Magnetic resonance imaging (MRI) a noninvasive diagnostic : GMAT Critical Reasoning (CR)
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# Magnetic resonance imaging (MRI) a noninvasive diagnostic

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Director
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Magnetic resonance imaging (MRI) a noninvasive diagnostic [#permalink]

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14 Nov 2005, 17:40
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Magnetic resonance imaging (MRI)â€”a noninvasive diagnostic procedureâ€”can be used to identify blockages in the coronary arteries. In contrast to angiogramsâ€”the invasive procedure customarily usedâ€”MRIâ€™s pose no risk to patients. Thus, to guarantee patient safety in the attempt to diagnose arterial blockages, MRIâ€™s should replace angiograms in all attempts at diagnosing coronary blockages.

Which of the following, if true, would most support the recommendation above?

(A) Angiograms can be used to diagnose conditions other than blockages in arteries.
(B) MRIâ€™s were designed primarily in order to diagnose blockages in the coronary arteries.
(D) An MRI is just as likely as an angiogram to identify an arterial blockage.
(E) Some patients for whom an angiogram presents no risk are unwilling to undergo an MRI.
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14 Nov 2005, 17:50
D.

Says MRI is at least as effective as Angiograms and thereby supporting conclusion.

C weakens the conclusion.
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14 Nov 2005, 17:59
But then, if MRI is as effective as angiogram, then how would D support the claim that MRI should replace angiogram...am i missing something??
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14 Nov 2005, 18:52
rahulraao wrote:
But then, if MRI is as effective as angiogram, then how would D support the claim that MRI should replace angiogram...am i missing something??

Because it is less risky. It is mentioned in the argument. The question just asks additional premise to strenthen it. If it is not as effective as angiogram, even if it involves reduced risk, it cannot replace angiogram.
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14 Nov 2005, 19:35
duttsit wrote:
rahulraao wrote:
But then, if MRI is as effective as angiogram, then how would D support the claim that MRI should replace angiogram...am i missing something??

Because it is less risky. It is mentioned in the argument. The question just asks additional premise to strenthen it. If it is not as effective as angiogram, even if it involves reduced risk, it cannot replace angiogram.

Yeah, if MRI is good enough, there's no reason not to use it.
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14 Nov 2005, 23:05
I vote for D.
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15 Nov 2005, 05:29
same reasonings to Duttsit's , it's D.
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Re: CR - Magnetic resonance imaging [#permalink]

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15 Nov 2005, 06:03
rahulraao wrote:
Magnetic resonance imaging (MRI)â€”a noninvasive diagnostic procedureâ€”can be used to identify blockages in the coronary arteries. In contrast to angiogramsâ€”the invasive procedure customarily usedâ€”MRIâ€™s pose no risk to patients. Thus, to guarantee patient safety in the attempt to diagnose arterial blockages, MRIâ€™s should replace angiograms in all attempts at diagnosing coronary blockages.

The Bold part is the key here. It explicitly says that angiogram pose risk to patients.

now if MRI is as likely as angiogram to identify a blockage, why would choose angiogram and be exposed to risk.

clearly C is strengtheningsupporting the argument.
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Re: CR - Magnetic resonance imaging [#permalink]

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15 Nov 2005, 06:20
nakib77 wrote:
rahulraao wrote:
Magnetic resonance imaging (MRI)â€”a noninvasive diagnostic procedureâ€”can be used to identify blockages in the coronary arteries. In contrast to angiogramsâ€”the invasive procedure customarily usedâ€”MRIâ€™s pose no risk to patients. Thus, to guarantee patient safety in the attempt to diagnose arterial blockages, MRIâ€™s should replace angiograms in all attempts at diagnosing coronary blockages.

The Bold part is the key here. It explicitly says that angiogram pose risk to patients.

now if MRI is as likely as angiogram to identify a blockage, why would choose angiogram and be exposed to risk.

clearly C is strengtheningsupporting the argument.

I guess you meant it's D
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Re: CR - Magnetic resonance imaging [#permalink]

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15 Nov 2005, 06:36
laxieqv wrote:
[

The Bold part is the key here. It explicitly says that angiogram pose risk to patients.

now if MRI is as likely as angiogram to identify a blockage, why would choose angiogram and be exposed to risk.

clearly C is strengtheningsupporting the argument.

I guess you meant it's D [/quote]

yup I meant D.... i guess long day at work
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Re: CR - Magnetic resonance imaging   [#permalink] 15 Nov 2005, 06:36
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