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

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11 Aug 2009, 18:46
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Magnetic resonance imaging (MRI) – a noninvasive diagnostic procedure – can be used to identify blockages in the coronary arteries. In contrast to angiograms – the invasive procedure customarily used – MRI’s pose no risk to patients. Thus, to guarantee patient safety in the attempt to diagnose arterial blockages, MRI’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) MRI’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.

[Reveal] Spoiler:
Eliminated A C & E. Left with B & D. Went with B. But OA is D.

How is D better than B? Any explanations?
If you have any questions
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Re: ETS Paper test#42 CR#10 [#permalink]

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11 Aug 2009, 18:58
Between B and D , I went with D

D mainly says that MRI scan is as good as angiogram , putting emphasis on MRI scan usability and comparing this with angiogram

while B says MRI was designed in order to diagnose blockages , note that this option is not saying that this is as good as customary method - angiogram
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Re: ETS Paper test#42 CR#10 [#permalink]

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11 Aug 2009, 19:55
YUP D:)My two cents..
Note the use of the word "primarily" in choice B.MRI's CANBE used to identify blockages..no mention of this being the PRIMARY purpose.Who knows?Maybe it was just introduced to replace angiograms..!
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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 01:00
IMO D
I suspect B because it doesn't mention whether MRI is as good as or better than angiogram. It simply says that MRI's were primarily designed in order to diagnose blockages, but no mention of their success or results.
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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 04:59
D it is

Note the question carefully.

to guarantee patient safety in the attempt to diagnose arterial blockages, MRI’s should replace angiograms in all attempts at diagnosing coronary blockages.

MRI is as good as angiograms when it comes to detection which will fulfill the condition (guarantee patient safety)

B is a close second. Primary purpose does not shed light on its performance.
For ex - Paracetamol's primary purpose is for the relief of fever but it is mainly used in numerous cold and flu remedies.

Hope this helps!
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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 07:11
Just my opinion on this, hope it will help others:

I saw this type of question in two official prep materials (one was the OG, the other one was either GMATprep or OG verbal, I'm not 100% sure) and, most importantly, in the real thing too. It's always something about comparing two different things, usually medicine or equipment. The question is formulated as such:
- objects and A and B are as efficient in an issue, but we chose B instead
- however, object B is better in some respect

You are supposed to find the statement that strengthens the argument. Three of the options will present positive points for A, while the issue is to pick between the remaining two. The "trick" here is to spot the answer that compares A and B and not to fall for the trap answer, which will list JUST A PLUS for B.

In one of the examples that I remember most clearly (I think it was from the OG), they were comparing two alarm systems that had the same rate of detecting break-ins. The better one was the alarm system that had the lowest rate of false positives.
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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 13:52
MRI is non-invasive while the angiogram is invasive.

The fact that the MRI is equally efficient in finding blockages and poses little health risk due to the non-invasive nature led me to chose D
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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 18:04
Nicely said danaJ

DanaJ wrote:
Just my opinion on this, hope it will help others:

I saw this type of question in two official prep materials (one was the OG, the other one was either GMATprep or OG verbal, I'm not 100% sure) and, most importantly, in the real thing too. It's always something about comparing two different things, usually medicine or equipment. The question is formulated as such:
- objects and A and B are as efficient in an issue, but we chose B instead
- however, object B is better in some respect

You are supposed to find the statement that strengthens the argument. Three of the options will present positive points for A, while the issue is to pick between the remaining two. The "trick" here is to spot the answer that compares A and B and not to fall for the trap answer, which will list JUST A PLUS for B.

In one of the examples that I remember most clearly (I think it was from the OG), they were comparing two alarm systems that had the same rate of detecting break-ins. The better one was the alarm system that had the lowest rate of false positives.

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Re: ETS Paper test#42 CR#10 [#permalink]

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12 Aug 2009, 19:19
D strengthens the argument more than B.
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Re: ETS Paper test#42 CR#10 [#permalink]

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10 Sep 2009, 10:41
D

I didn't think B was even close. The fact that MRI's are desgined for it doesn't mean that it will do a better job than angiograms.
Remember: the issue is MRIs vs Angiograms. B does not help you compare the two.
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Re: ETS Paper test#42 CR#10 [#permalink]

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24 Apr 2011, 04:16
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This is an assumption rather than strengthen question.
ans is D.

The assumption is the following: D shows that MRI and angiogram are comparable objects, and one can replace another one.
Use negation technique, if MRI is less effective than angiogram, I doubt that one must replace another. In this case the validity of conclusion fails apart.
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Re: ETS Paper test#42 CR#10   [#permalink] 24 Apr 2011, 04:16
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